Modbus UDP Feature Resquest

[theruskian]

Feature Request

Add the ability to use Modbus/TCP over a UDP transport.

Current behavior:

modbus establishes a TCP connection to the modbus slave and polls registers

Desired behavior:

Send modbus request over UDP to poll registers

Use case:

Modbus slaves that support UDP would benefit from the reduced overhead especially when there are multiple masters polling the device for data.

[andig]

There is an MIT-licensed client implementation out there (simonvetter/modbus#28).

[dammarco]

Solved by #85