Ok, it is solved 
On the GW, my wiring were good, but loose (but really, just a bit!). I soldered most of the wires on the arduino and now I receive information from the sensor!
Thanks all for the advices. I remember one of my US supervisor who use to say "Trust, but check, check and triple check". He is right indeed!
Nb; is it the habit on this forum to edit the title to [SOLVE]?
Thanks all for your replies
I was indeed waiting for new NRF24L01 modules and I just received them this morning. I so performed few more trials. Here goes the results:
@flopp said:
Do you have more NRF, then change.
Done, but no change at all 
@sundberg84 said:
What does your GW log looks like when you start the node? Do you see any presentation?
Maybe you also can post your code or is it unchanged from the humidity sensor?
GW log remains completely empty: no presentation at all. The code from the humidity sensor is unchanged.
@cranky said:
If you open up a serial console with the SerialGateway, you can respond with the following
255;255;3;0;4;[ID you want it to have]
Not pretty sure on what you mean. This command is performed on the gateway, or the sensor? I did it first on the sensor using the serial monitor, but nothing changed (I did it with id 0, with the one of the GW). And I tried on the sensor as well later on. But results were the same: a complete failure
@flopp said:
Do you have a capacitor on nRF24L01+?
I do not. I think it will be the next step!
As far as I understood, I do not have any communication between the GW and the sensor, and this either my wiring (but I already tripled check them) or my nRF24L01 (got them on Ebay, the quality is maybe poor). Am I right?
Thanks anyhow for all the advices!
Tried to change the Arduino Mini used by the sensor for a Arduino Uno. Nothing changed (here goes the log):
sensor started, id=255, parent=255, distance=255
find parent
send: 255-255-255-255 s=255,c=3,t=7,pt=0,l=0,sg=0,st=bc:
find parent
send: 255-255-255-255 s=255,c=3,t=7,pt=0,l=0,sg=0,st=bc:
find parent
send: 255-255-255-255 s=255,c=3,t=7,pt=0,l=0,sg=0,st=bc:
find parent
send: 255-255-255-255 s=255,c=3,t=7,pt=0,l=0,sg=0,st=bc:
find parent
send: 255-255-255-255 s=255,c=3,t=7,pt=0,l=0,sg=0,st=bc:
T: 19.00
find parent
send: 255-255-255-255 s=255,c=3,t=7,pt=0,l=0,sg=0,st=bc:
H: 65.50
find parent
send: 255-255-255-255 s=255,c=3,t=7,pt=0,l=0,sg=0,st=bc:
H: 65.60
find parent
send: 255-255-255-255 s=255,c=3,t=7,pt=0,l=0,sg=0,st=bc:
H: 65.80
find parent
send: 255-255-255-255 s=255,c=3,t=7,pt=0,l=0,sg=0,st=bc:
H: 65.50
find parent
send: 255-255-255-255 s=255,c=3,t=7,pt=0,l=0,sg=0,st=bc:
T: 19.10
find parent
send: 255-255-255-255 s=255,c=3,t=7,pt=0,l=0,sg=0,st=bc:
H: 65.70
The sensor can not indeed see the parent (see 1st line). I guess the NRF24L01 module is somehow not working (I doubled check all my wires and they are fine). Shame I do not have another one
Hi and thanks for the quick reply.
Debug is enabled I guess (see the 2 outputs in my first post), am I right?
Hi all,
I recently setup a MySensor serial gatexay to add to my DomoticZ controller. I used a Arduino Uno equiped with a NRF24L01 module as a gateway and a Arduino Mini for a humidity/temperature sensor.
I successfully added the gateway to DomoticZ, and the log, from both DomoticZ and serial monitoring , looked good:
0;0;3;0;9;gateway started, id=0, parent=0, distance=0
0;0;3;0;14;Gateway startup complete.
The sensor seems to work as well:
send: 255-255-255-255 s=255,c=3,t=7,pt=0,l=0,sg=0,st=bc:
find parent
send: 255-255-255-255 s=255,c=3,t=7,pt=0,l=0,sg=0,st=bc:
T: 18.50
find parent
send: 255-255-255-255 s=255,c=3,t=7,pt=0,l=0,sg=0,st=bc:
H: 64.90
But I can not see it in my Hardware section > MySensor Gateway.
My domoticZ log does not contain any MySensor entry. It looks like the sensor can not see the gateway. Am I right ? I tried to upload again all the sketches again, but nothing changed. Any clue ?
Thanks