I think that I will have some data on that by next tuesday, since that is also my #1 requirement. I will let you know!

@gohan
Ah sorry, I misunderstood.
The RFM95s VCC is factory-wired to a regulator on the moteino. It is an out of the box MCU+Radio-Unit.
See this link for clarification:
Moteino with RFM95

Sorry for the confusion.

EDIT: I just tried changing my normal 433MHz Gateway with Arduino Nano + RFM69HCW on the RPi for a Moteino-integrated-RFM69HCW one.
I have the same problem with that as with the LoRa Moteino GW... It works fine with the PC and even gets readings far away, I normally do not get.
Hooking it up to the RPi with FHEM it stops working...
I can't really explain that? :confused:

EDIT 2: I checked the debug of the sensor-sided unit. It says st=OK...
So I guess I'll have to check my hardware (FTDI etc.)

Thank you for the advice!

To begin with I followed lafleurs advice from this thread: https://forum.mysensors.org/topic/6718/8bit-or-32bit-processors/4

Unfortunately I wasn't able to establish communication by using the Zero-Board-definitions. I didn't really figure out what screwed up, since I was able to compile but it never really worked and I had no Serial-Monitor available.

Even tweaking the hardware definiton files didn't really work out. So I had a look into the initial error again to make it work with original Adafruit-FeatherM0-definitions. And I don't know why I didn't see that earlier:

Since SerialUSB wasn't declared I did a quick search for that error and I found this: https://forums.adafruit.com/viewtopic.php?f=22&t=88793

Apparently they changed "SerialUSB" to only "Serial".
I edited that in MyHwSAMD.h from

#ifndef MY_SERIALDEVICE
#define MY_SERIALDEVICE SerialUSB
#endif

to

#ifndef MY_SERIALDEVICE
#define MY_SERIALDEVICE Serial
#endif

and it seems to work now.
I will have to check with a gateway tomorrow. I hope this helps anyone in the future.

And btw. for the M0-Feather the PINs changed (I found that for the 32u4 and didn't notice the difference immediately).
You now need to define this before including the MySensors.h

    #define MY_RF69_SPI_CS 8
    #define MY_RF69_IRQ_PIN 3
    #define MY_RF69_IRQ_NUM 3

Thanks for the help and setting me on the right track! I will post if it works tomorrow.

Hi, I am also trying to get them to work and stumbled upon this. I will try that and let you know if it works.

@webzter30 I guess he connected it to RST on the Adafruit-board. He mentioned that before. And the breakout does work with 3-5V, so it should work with almost anything. But Adafruit stated that you should use the same power on VIN as on the logic circuits. So for a Nano that would be 5V

EDIT: Works for me! Thanks.