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The _modbus_receive_confirmation()_ function shall receive a request via the socket of the context 'ctx'. This function must be used for debugging purposes because the received response isn't checked against the initial request. This function can be convenient to receive request not handled by the library.
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The _modbus_send_raw_request()_ function shall send a request via the socket of the context 'ctx'. This function must be used for debugging purposes because you have to take care to make a valid request by hand. The function only adds to the message, the header or CRC of the selected backend, so 'raw_req' must start and contain at least a slave/unit identifier and a function code. This function can be used to send request not handled by the library.