Everything worked well for a few months but few days ago after some hours of work or after power outage OTG stops communication with boiler. The same with GW=R command.
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10:17:35.314614 OpenTherm Gateway 4.2.5
10:17:35.400497 Command: SC=10:17/5
10:17:35.470303 Command: SR=21:10,12
10:17:35.495786 Command: SR=22:7,226
10:17:35.520152 Thermostat disconnected
10:17:35.556328 SC: 10:17/5
10:17:35.569668 SR: 21:10/12
10:17:35.592700 SR: 22:7/226
10:17:36.253090 R00000000 Read-Data Status: 00000000 00000000
10:17:37.269427 R00000000 Read-Data Status: 00000000 00000000
10:17:38.284816 R00000000 Read-Data Status: 00000000 00000000
10:17:43.661204 R00000000 Read-Data Status: 00000000 00000000
10:18:00.000881 Command: SC=10:18/5
10:18:00.161051 SC: 10:18/5
10:19:00.001411 Command: SC=10:19/5
10:19:00.214855 SC: 10:19/5
10:20:00.000968 Command: SC=10:20/5
10:20:00.150603 SC: 10:20/5
I already tried to reflash PIC, but nothing changed. I have very strange test results with diagnosis firmware:
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Opentherm gateway diagnostics - Version 1.1
1. LED test
2. Bit timing thermostat
3. Bit timing boiler
4. Delay symmetry
5. Voltage levels
6. Idle times
Enter test number: 3
4403.
3910.
4583.
Opentherm gateway diagnostics - Version 1.1
1. LED test
2. Bit timing thermostat
3. Bit timing boiler
4. Delay symmetry
5. Voltage levels
6. Idle times
Enter test number: 5
Thermostat: 2.43, 2.50
Boiler: 2.56
Reference: 1.22
Opentherm gateway diagnostics - Version 1.1
1. LED test
2. Bit timing thermostat
3. Bit timing boiler
4. Delay symmetry
5. Voltage levels
6. Idle times
Enter test number: 6
Opentherm gateway diagnostics - Version 1.1
1. LED test
2. Bit timing thermostat
3. Bit timing boiler
4. Delay symmetry
5. Voltage levels
6. Idle times
Enter test number: 6
B: 9223.107
T: 14326.677
B: 19429.080