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Called when the message is ready to be transmit.  

Prototype

Arguments

p_conn

Pointer to the current HTTPc Connection Object.

p_msg

Pointer to the WebSocket Message to transmit 

Return Values

The length of the message to transmit.

Required Configuration

• The HTTPc_CFG_WEBSOCKET_EN configuration macro MUST be enabled.

Notes / Warnings

• When the dynamic mode is used, thus the total message length is unknown,  the value returned will be HTTPc_WEBSOCK_TX_MSG_LEN_NOT_DEFINED.  
• This hook is set in a HTTPc_WEBSOCK_MSG_OBJ using HTTPc_WebSockMsgSetParam() with the parameter HTTPc_PARAM_TYPE_WEBSOCK_MSG_ON_MSG_TX_INIT.
• Must be set to the HTTPc_WEBSOCK_MSG_OBJ before upgrading the connection with HTTPc_WebSockSend.