Modbus TCP blocking forever

[Konstantin-B87]

In modbus.py file, class ModbusTCP initialized with "self.socket.setblocking(True)".
I ran into an issue where the interact function hung inside the interact function and I believe it is because it is waiting for one of the socket.recv() calls to come back.
As there is also a lock which prevents from getting into the wrapper upstream, additional calls will not be able to get through causing all communications with the chamber to stop.

[PaulNongL]

This is due to the limitation of the (old) F4Ts/Firmware. On F4Ts with older firmware, locking and blocking should be a normal behavior. Newer F4Ts with new firmware, multiple TCP communications are possible, up to 4 TCP connections at a time.