commit a32d241b08af236b5ea1d4e18a390bdc561b435b
author Jagpal Singh Gill <paligill@gmail.com> Wed Oct 01 14:55:05 2025 -0700
committer Jagpal Singh Gill <paligill@gmail.com> Mon Oct 06 15:03:23 2025 -0700
tree ba63e51aaaa8bb177f6514c90f637a44bf6ca4cc
parent 9695bd284570b51677c11529103929c8e51da6b6

modbus_rtu_lib: implement library APIs

Implement modbus-rtu library APIs which will be used by
phosphor-modbus-rtu service based on [1].

[1]: https://gerrit.openbmc.org/c/openbmc/docs/+/77318

Tested:
Added a Mock Modbus RTU server using socat which intercepts and replies
to modbus messages for testing.
```
> meson test -C builddir
ninja: Entering directory `/host/repos/Modbus/phosphor-modbus/builddir'
ninja: no work to do.
1/2 test_modbus_commands        OK              0.01s
2/2 test_modbus                 OK              6.02s

Ok:                2
Fail:              0
```

Change-Id: I66cdc8fd930dd6f7ad6888116d1419ad8f8b8ed8
Signed-off-by: Jagpal Singh Gill <paligill@gmail.com>