As promised, what I found so far: the following dockerfile yeilds a usable cross-compile environment, provided you use it with a Makefile.

FROM ubuntu:xenial

RUN apt-get update \
    && apt-get install --yes \
      vim \
      build-essential \
      git

RUN git clone https://github.com/raspberrypi/tools

RUN git clone https://gist.github.com/3873805.git /build

WORKDIR "/build"

CMD ["/usr/bin/make", "CC=/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/arm-linux-gnueabihf-gcc"
, "HelloWorld"]


# Seems I need a real makefile for the above to work.

For cross compiling mysensors to work, hoever, you also need to properly seed the variable in configure, for it to work correctly. This is where I left off.

Sources:
https://stackoverflow.com/questions/18007326/how-to-change-default-values-of-variables-like-cc-in-makefile
https://bitbucket.org/mitchallen/pi-hello-cross-compile/src/master/
https://desertbot.io/blog/how-to-cross-compile-for-raspberry-pi
https://github.com/mitchallen/pi-cross-compile/blob/master/Dockerfile
https://github.com/mysensors/MySensors/blob/development/configure
https://github.com/raspberrypi/tools/tree/master/arm-bcm2708/arm-bcm2708-linux-gnueabi/bin
https://www.raspberrypi.org/documentation/linux/kernel/building.md
https://www.mysensors.org/build/raspberry

@monte yeah, it does only take that long. I think I got sidetracked a bit I usually set up my pi by Ansible, but it's very slow. I was thinking about ways to speed that up.

Maybe get my project working first before I dive into this. I'll post what I have so far shortly should anyone be interesed.

Thanks for screwing my head on straight again

As promised, what I found so far: the following dockerfile yeilds a usable cross-compile environment, provided you use it with a Makefile.

FROM ubuntu:xenial

RUN apt-get update \
    && apt-get install --yes \
      vim \
      build-essential \
      git

RUN git clone https://github.com/raspberrypi/tools

RUN git clone https://gist.github.com/3873805.git /build

WORKDIR "/build"

CMD ["/usr/bin/make", "CC=/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/arm-linux-gnueabihf-gcc"
, "HelloWorld"]


# Seems I need a real makefile for the above to work.

For cross compiling mysensors to work, hoever, you also need to properly seed the variable in configure, for it to work correctly. This is where I left off.

Sources:
https://stackoverflow.com/questions/18007326/how-to-change-default-values-of-variables-like-cc-in-makefile
https://bitbucket.org/mitchallen/pi-hello-cross-compile/src/master/
https://desertbot.io/blog/how-to-cross-compile-for-raspberry-pi
https://github.com/mitchallen/pi-cross-compile/blob/master/Dockerfile
https://github.com/mysensors/MySensors/blob/development/configure
https://github.com/raspberrypi/tools/tree/master/arm-bcm2708/arm-bcm2708-linux-gnueabi/bin
https://www.raspberrypi.org/documentation/linux/kernel/building.md
https://www.mysensors.org/build/raspberry

@monte yeah, it does only take that long. I think I got sidetracked a bit I usually set up my pi by Ansible, but it's very slow. I was thinking about ways to speed that up.

Maybe get my project working first before I dive into this. I'll post what I have so far shortly should anyone be interesed.

Thanks for screwing my head on straight again

Hi!

I'm about to attempt to cross compile a gateway for Arm (raspi 1 b+) on Ubuntu. Has anymore tried that before (I could't find any posts related)? Would it be interesting to document this here as well?

I had the same issue and found this post quite fast but although it says "(solved)" I found no solution. I am leaving my reply here for future reference.

What I did to fix the "It will be discarded" message:

[openhab.cfg]

This sets up the receiving end of the binding i.e. the server that binds the 5005 port.

udp:port=5005

[default.items]

This sets up the openhab binding to the string. Notice the asterisk after the IP address; because the client will connect to the server it will get assigned a random free port. The asterisk will catch all ports a client will get solving the "No channel is active or defined issue".

String 	String_FF_Bath_Test 	"Test String[%s]" 	 {udp="<[127.0.0.1:\*:'REGEX((.\*))']"}

[python]

Just some test code to easily send a UDP message to openhab.

import socket
UDP_IP = "127.0.0.1"
UDP_PORT = 5005
MESSAGE = "Hello world!"

print "UDP target IP:", UDP_IP
print "UDP target port:", UDP_PORT
print "message:", MESSAGE

sock = socket.socket(socket.AF_INET, # Internet
                 socket.SOCK_DGRAM) # UDP
sock.sendto(MESSAGE, (UDP_IP, UDP_PORT))