fix(inputs.modbus): Fix default value of transmission mode #12367
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resolves #11837
Currently, the
transmission_mode
's default value in the config does not match the actual behavior as pointed out in #11837. The difficulty is that we have a different default for TCP-based controllers ("TCP"
) and serial-controllers ("RTU"
). This PR introduces a new"auto"
value to capture this different behavior and makes it the new default.This PR does not change the actual behavior of the plugin but makes the configuration behavior more clear.