@neverdie thanks for the info, I appreciate your effort and investigations. I'll use my gateway and the sensor nodes at least in 1,5m height from the ground.
Today I got my nrF52832 and also the nRF52840. The E73..C modules are tiny (around 11x16mm). I can't use it without a breakout board. CDBYTE promised me to send me at least reference PCB design which I can then order from any PCB company.
The Skylab moduls are promising, but I see some deficiencies: No pinout, less pins (don't know what was skiped), no 32kHz low power quart for sleep timer ... I have ordered some other modules ... lets see, so far I can't test a lot without the carrier PCB's.
Then I join you with testing (range/transmisson test, sensor readout, battery measurement, ePaper ...)