Callback for messages recieved by the transport.
Return a negative value to cancel the network operation.
@param str The message from the transport @param len The length of the message @param payload Payload provided by the caller
See Implementation
Callback for messages recieved by the transport.
Return a negative value to cancel the network operation.
@param str The message from the transport @param len The length of the message @param payload Payload provided by the caller