WebSocket Errors
A WebSocket connection is run using a system socket; a system socket sits one layer lower in the networking stack. All WebSocket errors indicate some general issue communicating with ThingWorx Platform. The following table lists WebSocket errors, their corresponding codes, and an explanation of the issue.
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The default setting for DEFAULT_SOCKET_READ_TIMEOUT in twDefaultSettings.h is 0. This value is recommended for best performance when transferring large files. Refer to Best Practices for Transferring Large Files.
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Code
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Message
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Troubleshooting
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200
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TW_UNKNOWN_WEBSOCKET_ERROR
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An unknown error occurred on the WebSocket. This error should not appear.
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201
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TW_ERROR_INITIALIZING_WEBSOCKET
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An error occurred while initializing the WebSocket. Check your WebSocket configuration parameters for validity.
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202
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TW_TIMEOUT_INITIALIZING_WEBSOCKET
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A timeout occurred while initializing the WebSocket. Check the status of the connection to ThingWorx Platform.
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203
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TW_WEBSOCKET_NOT_CONNECTED
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The WebSocket is not connected to ThingWorx Platform. The requested operation cannot be performed.
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204
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TW_ERROR_PARSING_WEBSOCKET_DATA
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An error occurred while parsing WebSocket data. The parser could not break down the data from the WebSocket.
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205
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TW_ERROR_READING_FROM_WEBSOCKET
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An error occurred while reading data from the WebSocket. Retry the read operation. If necessary, resend the data.
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206
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TW_WEBSOCKET_FRAME_TOO_LARGE
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The SDK is attempting to send a WebSocket frame that is too large. The Maximum Frame Size is set when calling twAPI_Initialize and should always be set to the Message Chunk Size (twcfg.message_chunk_size).
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207
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TW_INVALID_WEBSOCKET_FRAME_TYPE
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The type of the frame coming in over the WebSocket is invalid.
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208
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TW_WEBSOCKET_MSG_TOO_LARGE
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The application is attempting to send a message that has been broken up in to chunks that are too large to fit in a frame. This error should not appear.
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209
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TW_ERROR_WRITING_TO_WEBSOCKET
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An error occurred while writing to the WebSocket.
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210
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TW_INVALID_ACCEPT_KEY
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The Accept key sent earlier from ThingWorx Platform is not valid.
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