Per-slot priority messages should be sent in more circumstances #31
Description
At present per-slot priority message sent once per second, and a single messages whenever taking over control.
To be compliant with the whitepaper and draft E1.31-1 we should:
- Send 3 per-slot packets at full rate before transmitting at the supressed rate
- Send 3 per-slot packets at full rate whenever priority changes before transmitting at the supressed rate