Modbus: Graph

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Allow "" and NULL on TCP host and service (=> IP=INADDR_ANY, and port=0) 2020-06-01, by Mario de Sousa
merge 2019-12-10, by Mario de Sousa
change hton() and ntoh() so we don't use (u8 *) to (u16 *) casts. Some compilers incorrectly change the pointer to force alignment with even addresses. 2019-12-10, by Mario de Sousa
Mario's fix for the pointer alignment problem. See changeset 4: 99009b24d401. 2019-12-10, by bmakuc
Variables start_addr and count were read from query_packet using function mb_ntoh_safe. It looks like some compilers change the pointer alignment if the first byte starts at an odd address. Because mb_ntoh_safe uses pointers slave address and count (number of registers) were not read correctly from the buffer when several modbus slaves were present in network. In this temporary solution pointer aritmetics is replaced by simple 256 multiplication. 2019-11-27, by bmakuc
Setting socket option so that TCP Modbus slave can re-use same port immediately after freeing it 2019-02-11, by Edouard Tisserant
Let Makefile use default CFLAGS and CC instead of overriding them 2018-11-16, by Edouard Tisserant
Remove incorrect inlines 2017-03-18, by Andrey Skvortsov

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Modbus