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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.
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Each function is decribed in one txt file. The file libmodbus.txt offers an overview of the library. It's possible to generate HTML and man outputs from the txt file. The documentation can be generated only if you have the required tools (asciidoc and xmlto). Better results are obtained with AsciiDoc v8.6+