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The loop test ought to iterate again to end the loop but this is only required if the socket contained more data than read.
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With the previous value UT_REGISTERS_NB, the server sent two consecutives and identical responses to the client. These requests could be confusing for the human reader!
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The arguments are surrounded by parentheses to be evaluated first.
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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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The error reported by #9 was already fixed in master but this change scrupulously respects the definition of DWORD.
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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+
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- updated comments - renamed internal constants (eg. _TIME_OUT_BEGIN_OF_TRAME in _TIME_OUT_BEGIN_OF_MESSAGE)
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To avoid to duplicate the documentation between source and documentation. The information already available in documentation is removed from source.
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Reported by Tobias Doerffel.
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Reported by Allan Cornet.
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- removed ENOTCONN errno not supported - set WINVER to Windows XP (and above) and add ws2_32.dll. So older Windows versions aren't supported.
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Reported by Patsy Kaye. Removed useless asignment at the same time.
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Extracted from octo/libmodbus ff/ipv6 a6ae017c82e
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Inspired by the branch ff/ipv6 of Florian Forster but this version uses a specific PI backend to isolate the IPv4 and IPv6 implementations. The existing TCP/IPv4 implementation has been kept intact (not rebased on the PI one) because its data backend requires fewer bytes than the PI. New functions modbus_new_tcp_pi, modbus_tcp_pi_listen and modbus_tcp_pi_accept and new backend called modbus_tcp_pi_t.
