Domoticz doesn't matter here at this point.

The logs I posted are from Arduino IDE Serial Monitor.

However, this can be closed without me yet again understanding what happened.

I made a mistake of changing two things at the same time.

I disconnected everything and left it for an hour or so.
I reconnected and launched MYSController - and the damned thing just started working at one. I didn't have to change any settings, include, click anything. It just worked.

Now, Domoticz works too, of course. All that's left is to start soldering on a proper board instead of the bread board I was using.

Thanks for trying @AWI :)

I've been seeing a funny thing for a while and finally got down to try to figure this thing out.

I have built a couple sensors with the BH1750 light sensor.
I know the sensor works and that the lux value is transferred to the gateway and read into OpenHAB, as seen here (this is pulled from debug logging from Karaf in OH2.1):

4;1;1;0;0;24.0
0;255;3;0;9;TSF:MSG:READ,4-4-0,s=0,c=1,t=1,pt=7,l=5,sg=0:52.3
4;0;1;0;1;52.3
0;255;3;0;9;TSF:MSG:READ,4-4-0,s=2,c=1,t=37,pt=3,l=2,sg=0:30
4;2;1;0;37;30
0;255;3;0;9;TSF:MSG:READ,4-4-0,s=255,c=3,t=0,pt=1,l=1,sg=0:31
4;255;3;0;0;31
0;255;3;0;9;TSF:MSG:READ,4-4-0,s=3,c=1,t=16,pt=0,l=1,sg=0:0
4;3;1;0;16;0

Light level is child sensor 2.

What bugs me is that each value gets transferred into an appropriate item, except for light level, as seen here:

22:28:38.347 [DEBUG] [rsAbstractConnection$MySensorsReader] - 4;1;1;0;0;24.0
22:28:38.349 [DEBUG] [rs.internal.gateway.MySensorsGateway] - Node 4 found in gateway
22:28:38.350 [DEBUG] [rs.internal.gateway.MySensorsGateway] - Child 1 found in node 4
22:28:38.352 [DEBUG] [ensors.handler.MySensorsThingHandler] - Updating channel: temp(0) value to: 24.0
22:28:38.383 [DEBUG] [ensors.handler.MySensorsThingHandler] - Setting last update for node/child 4/1 to 2017-07-09T22:28:38.000+0200
22:28:38.384 [DEBUG] [rsAbstractConnection$MySensorsReader] - 0;255;3;0;9;TSF:MSG:READ,4-4-0,s=0,c=1,t=1,pt=7,l=5,sg=0:52.3
22:28:38.386 [DEBUG] [rsAbstractConnection$MySensorsReader] - 4;0;1;0;1;52.3
22:28:38.387 [DEBUG] [rs.internal.gateway.MySensorsGateway] - Node 4 found in gateway
22:28:38.395 [DEBUG] [rs.internal.gateway.MySensorsGateway] - Child 0 found in node 4
22:28:38.397 [DEBUG] [ensors.handler.MySensorsThingHandler] - Updating channel: hum(1) value to: 52.3
22:28:38.405 [INFO ] [marthome.event.ItemStateChangedEvent] - iUS3TemperatureLC changed from 2017-07-09T22:26:26.000+0200 to 2017-07-09T22:28:38.000+0200
22:28:38.430 [DEBUG] [ensors.handler.MySensorsThingHandler] - Setting last update for node/child 4/0 to 2017-07-09T22:28:38.000+0200
22:28:38.431 [DEBUG] [rsAbstractConnection$MySensorsReader] - 0;255;3;0;9;TSF:MSG:READ,4-4-0,s=2,c=1,t=37,pt=3,l=2,sg=0:30
22:28:38.437 [DEBUG] [rsAbstractConnection$MySensorsReader] - 4;2;1;0;37;30
22:28:38.437 [INFO ] [marthome.event.ItemStateChangedEvent] - iUS3Humidity changed from 52.9 to 52.3
22:28:38.447 [DEBUG] [rs.internal.gateway.MySensorsGateway] - Node 4 found in gateway
22:28:38.448 [INFO ] [marthome.event.ItemStateChangedEvent] - iUS3HumidityLC changed from 2017-07-09T22:26:26.000+0200 to 2017-07-09T22:28:38.000+0200
22:28:38.449 [DEBUG] [rs.internal.gateway.MySensorsGateway] - Child 2 found in node 4
22:28:38.453 [DEBUG] [ensors.handler.MySensorsThingHandler] - Updating channel: level(37) value to: 30
22:28:38.462 [DEBUG] [ensors.handler.MySensorsThingHandler] - Setting last update for node/child 4/2 to 2017-07-09T22:28:38.000+0200
22:28:38.464 [DEBUG] [rsAbstractConnection$MySensorsReader] - 0;255;3;0;9;TSF:MSG:READ,4-4-0,s=255,c=3,t=0,pt=1,l=1,sg=0:31
22:28:38.465 [DEBUG] [rsAbstractConnection$MySensorsReader] - 4;255;3;0;0;31
22:28:38.469 [DEBUG] [rs.internal.gateway.MySensorsGateway] - Battery percent for node 4 update to: 31%
22:28:38.470 [DEBUG] [ensors.handler.MySensorsThingHandler] - Updating channel: battery value to: 31
22:28:38.472 [INFO ] [marthome.event.ItemStateChangedEvent] - iUS3LightLevelLC changed from 2017-07-09T22:26:26.000+0200 to 2017-07-09T22:28:38.000+0200
22:28:38.482 [DEBUG] [ensors.handler.MySensorsThingHandler] - Setting last update for node/child 4/0 to 2017-07-09T22:28:38.000+0200
22:28:38.483 [DEBUG] [ensors.handler.MySensorsThingHandler] - Updating channel: battery value to: 31
22:28:38.495 [INFO ] [marthome.event.ItemStateChangedEvent] - iUS3Battery changed from 99 to 31
22:28:38.496 [DEBUG] [ensors.handler.MySensorsThingHandler] - Setting last update for node/child 4/2 to 2017-07-09T22:28:38.000+0200
22:28:38.496 [DEBUG] [ensors.handler.MySensorsThingHandler] - Updating channel: battery value to: 31
22:28:38.513 [DEBUG] [ensors.handler.MySensorsThingHandler] - Setting last update for node/child 4/3 to 2017-07-09T22:28:38.000+0200
22:28:38.514 [DEBUG] [ensors.handler.MySensorsThingHandler] - Updating channel: battery value to: 31
22:28:38.524 [DEBUG] [ensors.handler.MySensorsThingHandler] - Setting last update for node/child 4/1 to 2017-07-09T22:28:38.000+0200
22:28:38.530 [DEBUG] [rsAbstractConnection$MySensorsReader] - 0;255;3;0;9;TSF:MSG:READ,4-4-0,s=3,c=1,t=16,pt=0,l=1,sg=0:0
22:28:38.530 [INFO ] [marthome.event.ItemStateChangedEvent] - iUS3MotionLC changed from 2017-07-09T22:26:26.000+0200 to 2017-07-09T22:28:38.000+0200
22:28:38.534 [DEBUG] [rsAbstractConnection$MySensorsReader] - 4;3;1;0;16;0
22:28:38.536 [DEBUG] [rs.internal.gateway.MySensorsGateway] - Node 4 found in gateway
22:28:38.537 [DEBUG] [rs.internal.gateway.MySensorsGateway] - Child 3 found in node 4
22:28:38.538 [DEBUG] [ensors.handler.MySensorsThingHandler] - Updating channel: tripped(16) value to: CLOSED
22:28:38.547 [DEBUG] [ensors.handler.MySensorsThingHandler] - Setting last update for node/child 4/3 to 2017-07-09T22:28:38.000+0200

It looks like the value for light just gets ignored.

I added light sensors via PaperUI by manually adding a thing and then an item from that (not using Simple mode).

The code for the sensor is pulled directly out of the example and in Arduino debug, the value is properly given.

Does anyone else have this problem?

@TimO - I live to serve ;) and find bugs.

Any idea on how soon it'll be available for general public?