0.31.x: Round thermostats that use OT are not supported

[zxdavb]

See:

15:12:56.188 RP --- 34:128145 30:205699 --:------ 3220 005 00C01C1B80 < PacketInvalid(%r < Unexpected code for src to Tx)
22:22:28.458 ||  34:128145 |  30:205699 | RP | opentherm_msg    |  1C  || {'msg_id': 28, 'msg_type': 'Read-Ack', 'msg_name': 'ReturnWaterTemperature', 'value': 27.5, 'description': 'Return water temperature'}

... also, the timestamps do not match and the %r should be something repr()