Filter outgoing messages

[schluis]

Problem

Currently, outgoing messages are directly written into the hardware interface with write_to_network.
This is a problem, since there is no centralized supervision and filter which checks the remaining_number_of_messages, which could lead to disqualification if more messages are sent then allowed.

Task

• Implement a centralized message filter.
• Route all outgoing messages through this filter.
• Filter for the remaining number of messages.

Further ideas

• Build a "smart-filter", which tries to detect bugs
  • E.g. some node wants to send a message every cycle -> mute this node and log an error