@emc2 Thanks! With this modification the sketch compiled successfully. Today I had time, so put everything together, and the BME280 works with the 2.4GH radio, temp/hum/pressure all reporting like they should.
Using arduino pro mini, bme280, nrf24, 2XAA Batteries. It reports to the mysensors serial gw, and then shown in domoticz.
I was able to do a photo, so the dallas temp, and le33 "mask" is on the opposite side, I think this is the problem. (in your example pictures they are on the good side)
No worries, I use currently the newbie pcbs for light switching,
Thanks Guys, finally a sketch which compiled for me :) I will try it in Domoticz later on.
@mfalkvidd good question, yes I have removed the two leds I found, but I am too lame to remove the voltage regulator :( I have read here that the most consuming part is the LED(s)
