UI Server: add WS Insomnia requests collection
[e-mobility-charging-stations-simulator.git] / README.md
index 9ec051379a4a9956bec4df10d8ca4dc0d9ed154a..637f20da0494dc5c33baa3c19569386ee12d0c76 100644 (file)
--- a/README.md
+++ b/README.md
@@ -1,10 +1,12 @@
+<!-- markdownlint-disable-file MD033 MD024 -->
+
 # [e-mobility charging stations simulator](https://github.com/sap/e-mobility-charging-stations-simulator)
 
 [![REUSE status](https://api.reuse.software/badge/github.com/SAP/e-mobility-charging-stations-simulator)](https://api.reuse.software/info/github.com/SAP/e-mobility-charging-stations-simulator)
 
 ## Summary
 
-Simple [node.js](https://nodejs.org/) software to simulate a set of charging stations based on the OCPP-J 1.6 protocol as part of SAP e-Mobility solution.
+Simple [node.js](https://nodejs.org/) software to simulate and scale a set of charging stations based on the OCPP-J 1.6 protocol as part of SAP e-Mobility solution.
 
 ## Prerequisites
 
@@ -26,7 +28,7 @@ choco install -y nodejs-lts
 brew install node@16
 ```
 
-### GNU/Linux:
+### GNU/Linux
 
 - [NodeSource](https://github.com/nodesource/distributions) Node.js Binary Distributions for version >= 16.X
 
@@ -51,7 +53,7 @@ To start the program, run: `npm start`.
 
 ## Start Web UI
 
-See Web UI [README.md](src/ui/web/README.md) for more information.
+See Web UI [README.md](ui/web/README.md) for more information.
 
 ## Configuration files syntax
 
@@ -88,24 +90,24 @@ But the modifications to test have to be done to the files in the build target d
 
 **src/assets/config.json**:
 
-| Key                        | Value(s)                                         | Default Value                                                                                                                                                                                                  | Value type                                                                                                                                                                                                                          | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
-| -------------------------- | ------------------------------------------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
-| supervisionUrls            |                                                  | []                                                                                                                                                                                                             | string \| string[]                                                                                                                                                                                                                  | string or array of global connection URIs to OCPP-J servers                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
-| supervisionUrlDistribution | round-robin/random/sequential                    | round-robin                                                                                                                                                                                                    | boolean                                                                                                                                                                                                                             | supervision urls distribution policy to simulated charging stations                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
-| logStatisticsInterval      |                                                  | 60                                                                                                                                                                                                             | integer                                                                                                                                                                                                                             | seconds between charging stations statistics output in the logs                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
-| logConsole                 | true/false                                       | false                                                                                                                                                                                                          | boolean                                                                                                                                                                                                                             | output logs on the console                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
-| logFormat                  |                                                  | simple                                                                                                                                                                                                         | string                                                                                                                                                                                                                              | winston log format                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
-| logRotate                  | true/false                                       | true                                                                                                                                                                                                           | boolean                                                                                                                                                                                                                             | enable daily log files rotation                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
-| logMaxFiles                |                                                  | 7                                                                                                                                                                                                              | integer                                                                                                                                                                                                                             | maximum number of log files to keep                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
-| logLevel                   | emerg/alert/crit/error/warning/notice/info/debug | info                                                                                                                                                                                                           | string                                                                                                                                                                                                                              | winston logging level                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
-| logFile                    |                                                  | combined.log                                                                                                                                                                                                   | string                                                                                                                                                                                                                              | log file relative path                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
-| logErrorFile               |                                                  | error.log                                                                                                                                                                                                      | string                                                                                                                                                                                                                              | error log file relative path                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
-| worker                     |                                                  | {<br />"processType": "workerSet",<br />"startDelay": 500,<br />"elementStartDelay": 0,<br />"elementsPerWorker": 1,<br />"poolMinSize": 4,<br />"poolMaxSize": 16,<br />"poolStrategy": "ROUND_ROBBIN"<br />} | {<br />processType: WorkerProcessType;<br />startDelay: number;<br />elementStartDelay: number;<br />elementsPerWorker: number;<br />poolMinSize: number;<br />poolMaxSize: number;<br />poolStrategy: WorkerChoiceStrategy;<br />} | Worker configuration section:<br />- processType: worker threads process type (workerSet/staticPool/dynamicPool)<br />- startDelay: milliseconds to wait at worker threads startup (only for workerSet threads process type)<br />- elementStartDelay: milliseconds to wait at charging station startup<br />- elementsPerWorker: number of charging stations per worker threads for the `workerSet` process type<br />- poolMinSize: worker threads pool minimum number of threads</br >- poolMaxSize: worker threads pool maximum number of threads<br />- poolStrategy: worker threads pool [poolifier](https://github.com/poolifier/poolifier) worker choice strategy |
-| uiServer                   |                                                  | {<br />"enabled": true,<br />"type": "ws",<br />"options": {<br />"host: "localhost",<br />"port": 8080<br />}<br />}                                                                                          | {<br />enabled: boolean;<br />type: ApplicationProtocol;<br />options: ServerOptions;<br />authentication: {<br />enabled: boolean;<br />type: AuthenticationType;<br />username: string;<br />password: string;<br />}<br />}      | UI server configuration section                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
-| performanceStorage         |                                                  | {<br />"enabled": false,<br />"type": "jsonfile",<br />"file:///performanceRecords.json"<br />}                                                                                                                | {<br />enabled: boolean;<br />type: string;<br />URI: string;<br />}<br />where type can be 'jsonfile' or 'mongodb'                                                                                                                 | performance storage configuration section                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
-| stationTemplateUrls        |                                                  | {}[]                                                                                                                                                                                                           | {<br />file: string;<br />numberOfStations: number;<br />}[]                                                                                                                                                                        | array of charging station configuration templates URIs configuration section (charging station configuration template file name and number of stations)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
-
-#### Worker process model:
+| Key                        | Value(s)                                         | Default Value                                                                                                                                                                                                 | Value type                                                                                                                                                                                                                          | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
+| -------------------------- | ------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| supervisionUrls            |                                                  | []                                                                                                                                                                                                            | string \| string[]                                                                                                                                                                                                                  | string or array of global connection URIs to OCPP-J servers                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
+| supervisionUrlDistribution | round-robin/random/charging-station-affinity     | charging-station-affinity                                                                                                                                                                                     | boolean                                                                                                                                                                                                                             | supervision urls distribution policy to simulated charging stations                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
+| logStatisticsInterval      |                                                  | 60                                                                                                                                                                                                            | integer                                                                                                                                                                                                                             | seconds between charging stations statistics output in the logs                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
+| logConsole                 | true/false                                       | false                                                                                                                                                                                                         | boolean                                                                                                                                                                                                                             | output logs on the console                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
+| logFormat                  |                                                  | simple                                                                                                                                                                                                        | string                                                                                                                                                                                                                              | winston log format                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
+| logRotate                  | true/false                                       | true                                                                                                                                                                                                          | boolean                                                                                                                                                                                                                             | enable daily log files rotation                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
+| logMaxFiles                |                                                  | 7                                                                                                                                                                                                             | integer                                                                                                                                                                                                                             | maximum number of log files to keep                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
+| logLevel                   | emerg/alert/crit/error/warning/notice/info/debug | info                                                                                                                                                                                                          | string                                                                                                                                                                                                                              | winston logging level                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
+| logFile                    |                                                  | combined.log                                                                                                                                                                                                  | string                                                                                                                                                                                                                              | log file relative path                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
+| logErrorFile               |                                                  | error.log                                                                                                                                                                                                     | string                                                                                                                                                                                                                              | error log file relative path                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
+| worker                     |                                                  | {<br />"processType": "workerSet",<br />"startDelay": 500,<br />"elementStartDelay": 0,<br />"elementsPerWorker": 1,<br />"poolMinSize": 4,<br />"poolMaxSize": 16,<br />"poolStrategy": "ROUND_ROBIN"<br />} | {<br />processType: WorkerProcessType;<br />startDelay: number;<br />elementStartDelay: number;<br />elementsPerWorker: number;<br />poolMinSize: number;<br />poolMaxSize: number;<br />poolStrategy: WorkerChoiceStrategy;<br />} | Worker configuration section:<br />- processType: worker threads process type (workerSet/staticPool/dynamicPool)<br />- startDelay: milliseconds to wait at worker threads startup (only for workerSet threads process type)<br />- elementStartDelay: milliseconds to wait at charging station startup<br />- elementsPerWorker: number of charging stations per worker threads for the `workerSet` process type<br />- poolMinSize: worker threads pool minimum number of threads</br >- poolMaxSize: worker threads pool maximum number of threads<br />- poolStrategy: worker threads pool [poolifier](https://github.com/poolifier/poolifier) worker choice strategy |
+| uiServer                   |                                                  | {<br />"enabled": true,<br />"type": "ws",<br />"options": {<br />"host": "localhost",<br />"port": 8080<br />}<br />}                                                                                        | {<br />enabled: boolean;<br />type: ApplicationProtocol;<br />options: ServerOptions;<br />authentication: {<br />enabled: boolean;<br />type: AuthenticationType;<br />username: string;<br />password: string;<br />}<br />}      | UI server configuration section                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
+| performanceStorage         |                                                  | {<br />"enabled": false,<br />"type": "jsonfile",<br />"file:///performanceRecords.json"<br />}                                                                                                               | {<br />enabled: boolean;<br />type: string;<br />URI: string;<br />}<br />where type can be 'jsonfile' or 'mongodb'                                                                                                                 | performance storage configuration section                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
+| stationTemplateUrls        |                                                  | {}[]                                                                                                                                                                                                          | {<br />file: string;<br />numberOfStations: number;<br />}[]                                                                                                                                                                        | array of charging station configuration templates URIs configuration section (charging station configuration template file name and number of stations)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
+
+#### Worker process model
 
 - **workerSet**:
   Worker set executing each a static number (elementsPerWorker) of simulated charging stations from the total
@@ -168,7 +170,8 @@ But the modifications to test have to be done to the files in the build target d
 | mainVoltageMeterValues             | true/false | true                                                              | boolean                                                                                                                            | include charging stations main voltage MeterValues on three phased charging stations                                                                                                                  |
 | phaseLineToLineVoltageMeterValues  | true/false | true                                                              | boolean                                                                                                                            | include charging stations line to line voltage MeterValues on three phased charging stations                                                                                                          |
 | customValueLimitationMeterValues   | true/false | true                                                              | boolean                                                                                                                            | enable limitation on custom fluctuated value in MeterValues                                                                                                                                           |
-| commandsSupport                    |            | {<br />"incomingCommands": {},<br />"outgoingCommands": {}<br />} | {<br /> incomingCommands: Record<IncomingRequestCommand, boolean>;<br />outgoingCommands?: Record<RequestCommand, boolean>;<br />} | Configuration section for OCPP commands support. Empty section or subsections means all implemented commands are supported                                                                            |
+| commandsSupport                    |            | {<br />"incomingCommands": {},<br />"outgoingCommands": {}<br />} | {<br /> incomingCommands: Record<IncomingRequestCommand, boolean>;<br />outgoingCommands?: Record<RequestCommand, boolean>;<br />} | Configuration section for OCPP commands support. Empty section or subsections means all implemented OCPP commands are supported                                                                       |
+| messageTriggerSupport              |            | {}                                                                | Record<MessageTrigger, boolean>                                                                                                    | Configuration section for OCPP commands trigger support. Empty section means all implemented OCPP trigger commands are supported                                                                      |
 | Configuration                      |            |                                                                   | ChargingStationConfiguration                                                                                                       | charging stations OCPP parameters configuration section                                                                                                                                               |
 | AutomaticTransactionGenerator      |            |                                                                   | AutomaticTransactionGenerator                                                                                                      | charging stations ATG configuration section                                                                                                                                                           |
 | Connectors                         |            |                                                                   | Connectors                                                                                                                         | charging stations connectors configuration section                                                                                                                                                    |
@@ -201,6 +204,25 @@ But the modifications to test have to be done to the files in the build target d
 
 #### AutomaticTransactionGenerator section
 
+Section type definition:
+
+```ts
+type AutomaticTransactionGeneratorConfiguration = {
+  enable: boolean;
+  minDuration: number;
+  maxDuration: number;
+  minDelayBetweenTwoTransactions: number;
+  maxDelayBetweenTwoTransactions: number;
+  probabilityOfStart: number;
+  stopAfterHours: number;
+  stopOnConnectionFailure: boolean;
+  requireAuthorize?: boolean;
+  idTagDistribution?: 'random' | 'round-robin' | 'connector-affinity';
+};
+```
+
+Section example:
+
 ```json
   "AutomaticTransactionGenerator": {
     "enable": false,
@@ -211,7 +233,8 @@ But the modifications to test have to be done to the files in the build target d
     "probabilityOfStart": 1,
     "stopAfterHours": 0.3,
     "stopOnConnectionFailure": true,
-    "requireAuthorize": true
+    "requireAuthorize": true,
+    "idTagDistribution": "random"
   }
 ```
 
@@ -287,7 +310,7 @@ make SUBMODULES_INIT=true
 - :white_check_mark: ChangeAvailability
 - :white_check_mark: ChangeConfiguration
 - :white_check_mark: ClearCache
-- :x: DataTransfer
+- :white_check_mark: DataTransfer
 - :white_check_mark: GetConfiguration
 - :white_check_mark: Heartbeat
 - :white_check_mark: MeterValues
@@ -388,7 +411,7 @@ Protocol to control the simulator via a Websocket or HTTP server.
 
 ### HTTP Protocol
 
-To learn how to use the HTTP protocol to pilot the simulator, an [Insomnia](https://insomnia.rest/) requests collection is available in [src/assets](./src/assets/) directory.
+To learn how to use the HTTP protocol to pilot the simulator, an [Insomnia](https://insomnia.rest/) HTTP requests collection is available in [src/assets/ui-protocol](./src/assets/ui-protocol) directory.
 
 ### Websocket Protocol
 
@@ -405,6 +428,8 @@ SRPC protocol over Websocket. PDU stands for 'Protocol Data Unit'.
   `uuid`: String uniquely linking the response to the request  
   `PDU`: Response parameters to requested procedure
 
+An [Insomnia](https://insomnia.rest/) WebSocket requests collection is available in [src/assets/ui-protocol](./src/assets/ui-protocol) directory.
+
 #### Version 0.0.1
 
 Set the Websocket header _Sec-Websocket-Protocol_ to `ui0.0.1`.
@@ -445,41 +470,6 @@ Set the Websocket header _Sec-Websocket-Protocol_ to `ui0.0.1`.
   `chargingStations`: ChargingStationData[]  
   }
 
-###### Start Transaction
-
-- Request:  
-  `ProcedureName`: 'startTransaction'  
-  `PDU`: {  
-  `hashIds`: charging station unique identifier strings array (optional, default: all charging stations),  
-  `connectorId`: connector id integer,  
-  `idTag`: RFID tag string  
-  }
-
-- Response:  
-  `PDU`: {  
-  `status`: 'success' | 'failure',  
-  `hashIdsSucceeded`: charging station unique identifier strings array,  
-  `hashIdsFailed`: charging station unique identifier strings array (optional),  
-  `responsesFailed`: failed responses payload array (optional)  
-  }
-
-###### Stop Transaction
-
-- Request:  
-  `ProcedureName`: 'stopTransaction'  
-  `PDU`: {  
-  `hashIds`: charging station unique identifier strings array (optional, default: all charging stations),  
-  `transactionId`: transaction id integer  
-  }
-
-- Response:  
-  `PDU`: {  
-  `status`: 'success' | 'failure',  
-  `hashIdsSucceeded`: charging station unique identifier strings array,  
-  `hashIdsFailed`: charging station unique identifier strings array (optional),  
-  `responsesFailed`: failed responses payload array (optional)  
-  }
-
 ###### Start Charging Station
 
 - Request:  
@@ -493,6 +483,7 @@ Set the Websocket header _Sec-Websocket-Protocol_ to `ui0.0.1`.
   `status`: 'success' | 'failure',  
   `hashIdsSucceeded`: charging station unique identifier strings array,  
   `hashIdsFailed`: charging station unique identifier strings array (optional)  
+  `responsesFailed`: failed responses payload array (optional)  
   }
 
 ###### Stop Charging Station
@@ -507,7 +498,8 @@ Set the Websocket header _Sec-Websocket-Protocol_ to `ui0.0.1`.
   `PDU`: {  
   `status`: 'success' | 'failure',  
   `hashIdsSucceeded`: charging station unique identifier strings array,  
-  `hashIdsFailed`: charging station unique identifier strings array (optional)  
+  `hashIdsFailed`: charging station unique identifier strings array (optional),  
+  `responsesFailed`: failed responses payload array (optional)  
   }
 
 ###### Open Connection
@@ -522,7 +514,8 @@ Set the Websocket header _Sec-Websocket-Protocol_ to `ui0.0.1`.
   `PDU`: {  
   `status`: 'success' | 'failure',  
   `hashIdsSucceeded`: charging station unique identifier strings array,  
-  `hashIdsFailed`: charging station unique identifier strings array (optional)  
+  `hashIdsFailed`: charging station unique identifier strings array (optional),  
+  `responsesFailed`: failed responses payload array (optional)  
   }
 
 ###### Close Connection
@@ -537,7 +530,8 @@ Set the Websocket header _Sec-Websocket-Protocol_ to `ui0.0.1`.
   `PDU`: {  
   `status`: 'success' | 'failure',  
   `hashIdsSucceeded`: charging station unique identifier strings array,  
-  `hashIdsFailed`: charging station unique identifier strings array (optional)  
+  `hashIdsFailed`: charging station unique identifier strings array (optional),  
+  `responsesFailed`: failed responses payload array (optional)  
   }
 
 ###### Start Automatic Transaction Generator
@@ -574,22 +568,94 @@ Set the Websocket header _Sec-Websocket-Protocol_ to `ui0.0.1`.
   `responsesFailed`: failed responses payload array (optional)  
   }
 
-###### Status Notification
+###### OCPP commands trigger
 
 - Request:  
-  `ProcedureName`: 'StatusNotification'  
+  `ProcedureName`: 'commandName' (the OCPP command name in camel case)  
   `PDU`: {  
-  `hashIds`: charging station unique identifier strings array (optional, default: all charging stations),  
-  `connectorId`: connector id integer  
-  }
+   `hashIds`: charging station unique identifier strings array (optional, default: all charging stations),  
+   ...`commandPayload`  
+   } (the OCPP command payload with some optional fields added to target the simulated charging stations)
 
 - Response:  
-  `PDU`: {  
-  `status`: 'success' | 'failure',  
-  `hashIdsSucceeded`: charging station unique identifier strings array,  
-  `hashIdsFailed`: charging station unique identifier strings array (optional),  
-  `responsesFailed`: failed responses payload array (optional)  
-  }
+   `PDU`: {  
+   `status`: 'success' | 'failure',  
+   `hashIdsSucceeded`: charging station unique identifier strings array,  
+   `hashIdsFailed`: charging station unique identifier strings array (optional),  
+   `responsesFailed`: failed responses payload array (optional)  
+   }
+
+Examples:
+
+- **Start Transaction**
+
+  - Request:  
+    `ProcedureName`: 'startTransaction'  
+    `PDU`: {  
+    `hashIds`: charging station unique identifier strings array (optional, default: all charging stations),  
+    `connectorId`: connector id integer,  
+    `idTag`: RFID tag string  
+    }
+
+  - Response:  
+    `PDU`: {  
+    `status`: 'success' | 'failure',  
+    `hashIdsSucceeded`: charging station unique identifier strings array,  
+    `hashIdsFailed`: charging station unique identifier strings array (optional),  
+    `responsesFailed`: failed responses payload array (optional)  
+    }
+
+- **Stop Transaction**
+
+  - Request:  
+    `ProcedureName`: 'stopTransaction'  
+    `PDU`: {  
+    `hashIds`: charging station unique identifier strings array (optional, default: all charging stations),  
+    `transactionId`: transaction id integer  
+    }
+
+  - Response:  
+    `PDU`: {  
+    `status`: 'success' | 'failure',  
+    `hashIdsSucceeded`: charging station unique identifier strings array,  
+    `hashIdsFailed`: charging station unique identifier strings array (optional),  
+    `responsesFailed`: failed responses payload array (optional)  
+    }
+
+- **Status Notification**
+
+  - Request:  
+    `ProcedureName`: 'statusNotification'  
+    `PDU`: {  
+    `hashIds`: charging station unique identifier strings array (optional, default: all charging stations),  
+    `connectorId`: connector id integer,  
+    `errorCode`: connector error code,  
+    `status`: connector status  
+    }
+
+  - Response:  
+    `PDU`: {  
+    `status`: 'success' | 'failure',  
+    `hashIdsSucceeded`: charging station unique identifier strings array,  
+    `hashIdsFailed`: charging station unique identifier strings array (optional),  
+    `responsesFailed`: failed responses payload array (optional)  
+    }
+
+- **Heartbeat**
+
+  - Request:  
+    `ProcedureName`: 'heartbeat'  
+    `PDU`: {  
+    `hashIds`: charging station unique identifier strings array (optional, default: all charging stations),  
+    }
+
+  - Response:  
+    `PDU`: {  
+    `status`: 'success' | 'failure',  
+    `hashIdsSucceeded`: charging station unique identifier strings array,  
+    `hashIdsFailed`: charging station unique identifier strings array (optional),  
+    `responsesFailed`: failed responses payload array (optional)  
+    }
 
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