Use these scripts to broadcast unencrypted data across your network. Originally intended for use with power-monitoring so multiple devices could handle on-battery events from an uninterrupted power supply.
Multiple senders can send data to the same group/port, which will be received by all listeners.
Copy config.ini.template to config.ini, and create a shared key for use by all your senders and receivers.
Pipe or provide data to send.py as a parameter.
receive.py will print out the data provided to send.py between start and end tags:
### Start message a51214ef0 ###
Stuff!
### End message a51214ef0 ###
Use receive-raw.py to see data transmitted without safety validations.
The data transmitted across the wire is unencrypted, so it can be read by any multicast client on your network. However, I have taken steps to allow "trusted" use, where you rely on the information even though it may be read openly.
Through the use of a shared key, as well as run-time generated random data and a transmission counter, receivers should be relatively well protected against in-flight data corruption (unintentional or otherwise) as well as duplicate transmission.
Corrupted data, or data received multiple times will be silently dropped unless the receive.py debug flag is activated.