nat/ussd: Add an example of the USSD gateway side-channel

This adds a very basic, use once example in python on how to connect
and deal with the app specific payload and messages. The code is not
complete as the invokeId should be patched according to the initial
invoke. This excercise is left to future readers of that code.
1 file changed
tree: 56ef637f7aa5880713b0807e447fe2b820a87c91
  1. contrib/
  2. debian/
  3. openbsc/
  4. .gitignore