Found the problem!
Ahum........the usb adapter for the gateway didn't have enough power to setup the NRF24 radio network 
When trying a better/heavier adapter for the gateway, everything worked fine!
Did change the radio channel to 124, so the garage sensors cannot connect to the house gateway.
Thanks for the help!
Hi @skywatch,
Gateway 1 has 192.168.0.120:4444
Gateway 2 has 192.168.0.119:5003
I guess both need to have a different ip and the port should not matter.
Found the problem!
Ahum........the usb adapter for the gateway didn't have enough power to setup the NRF24 radio network
When trying a better/heavier adapter for the gateway, everything worked fine!
Did change the radio channel to 124, so the garage sensors cannot connect to the house gateway.
Thanks for the help!
Hi @skywatch,
Gateway 1 has 192.168.0.120:4444
Gateway 2 has 192.168.0.119:5003
I guess both need to have a different ip and the port should not matter.
Couldnt get it to work, so the gas and powermeters where replaced after a call to the Energy company. The new P1 smartmeters is connected with usb to Domoticz and works like a charm!
Topic can be closed.
Hi everybody,
i have an issue of which i can find not enough info on to solve it
Made a second Ethernet gateway for my garage in which sensors cannot reach the original gateway (too much isolation). Installed a Powerline adaptor to create a network in the garage which works perfectly. The gateway is assigned to Domoticz and is showing alive (no errors in the log or what so ever).
I first disconnected the first gateway, added the second gateway to Domoticz and added a temp/hum Mysensors sensor. Everything went fine, data was coming through and no errors.
Then disconnected the second gateway and hooked it up in the garage (wired with utp to the Powerline adaptor) and waited for an 'alive' signal in Domoticz. The signal got through and the logs show it is connected to the gateway --> MySensors: connected to: 192.168.0.119:5003
Then connected the first gateway again (data was getting in from all the sensors connected to the first gateway).
When I power up the temp/hum sensor connected to the second gateway, the Arduino monitor shows connection with the gateway (no FPAR errors) and data is being sent out, but no data is coming in via the second gateway in Domoticz. Still no errors in the log.
I found some stories about the channel of both gateways which should be the same/different, but without any luck of people getting it to work.
I'm running latest version of Mysensor (2.3.1) and when testing the sensor without the first gateway connected, it works fine. Both gateways are in server mode and both assigned to a unique ip (which I both can succesfully ping via cmd).
All sensors connected on the first gateway are working flawlessly.
Anyone any idea?
PS: sorry for the long and possibly confusing story 
Hi @zboblamont,
that is not my usage per day according to the reports. I use 30-40 kwh per day so is seems to be the cumulative which is wrong. The cumulative is also different from which is being shown by the Reports page in Domoticz.
Ill delete the sensor and add it again to see if it counts properly now.
The offset would be an easy solution, in this case the total power usage is displayed as negative on the dashboard. The data in the log is very complete and correct.
Any idea how to solve the negative counter on the dashboard?
Hi everybody,
since Toon decided not to send the energy and gas values to Domoticz anymore (without having to API hack everything...) i made the Power Meter Pulse sensor and script. Got everything working eventually, but there are some measured values from testing (86 kwh in this case) which i want to reset.
I have looked everywhere in Domoticz how to reset the value(s) but i cannot find it. Am i overlooking something or what?
Thanks for the help!