MUSTARDTIGER FPV

Refactor ADS-B input support in Mission Planner

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## What this PR accomplishes This PR refactors a significant portion of ADS-B support in Mission Planner. In the process of developing [MavADSB](https://github.com/MUSTARDTIGERFPV/MavADSB) I ran into a good number of...

Support UBLOX GPS Protocol

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FormationFlight Direct GNSS should support UBLOX protocol, not just NMEA.

Permit users to assign fixed names especially for the WiFi Access Point

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**Describe the solution you'd like** Permit users to configure a static-assigned FormationFlight name **Additional context** This should be after #6; once that's done, we can support this via a web...

Users on UART-limited flight controllers should be able to use 1 UART for both GPS & FormationFlight. See https://github.com/FormationFlight/FormationFlight/tree/gnss-inject

Support ExpressLRS-style passthrough flashing

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**Describe the solution you'd like** FormationFlight should be able to be passthrough flashed in the same way as ExpressLRS. We should support a return to bootloader command, and should have...

**Is your feature request related to a problem? Please describe.** Major FF radio reconfigurations require a reflash **Describe the solution you'd like** Certain settings should be changeable through the HTTP...

Add MAVLink support to Backpack

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Should be easy as pie to use - Backpack autodetects when it sees MAVLink heartbeats and starts a WiFi network, and runs the "standard" UDP ports so Mission Planner should...

Add docs for serial VTX control

Make 1 in 10 HEARTBEATS from the MAV get broadcasted so new GCSes can find the Backpack

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If we always unicast, then a newly-arrived GCS won't be able to connect since the MAVLink traffic will be going to the IP of the old GCS until we receive...