Fix compile warning

Add missing return statement

Turn the number of NULL packets into parameter

Update NULL PPS after test with flight module

Add TS NULL packet filler to pipeline

New power limit

Set default symbol rate to 6.25 MSps

Update safe power limit

Ensure remote gain is limited to safe flight value

Add control client to make clean target

Add simple control client

Add gain control interface

Remove unused variable

Don't start TX if there is a HW error

Update license.txt