Mission: provide API to clear mission

[julianoes]

We should probably offer a method that allows to wipe any missions stored on the vehicle. Right now, we can achieve this by uploading an empty mission item list but that's not really visible.

An alternative would be to document what it means to upload an empty list.

The underlying message to send would be: https://mavlink.io/en/messages/common.html#MISSION_CLEAR_ALL

[JonasVautherin]

How many missions can be stored on the vehicle?

[julianoes]

Two but only one at a time. So let's say you're flying 0 and uploading a mission, then it will be stored to 1. Once fully uploaded, everything will switch over to 1.

That's for missions, then there is also stuff around geofence, etc.

[hamishwillee]

FYI clear mission is documented in https://mavlink.io/en/services/mission.html#clear_mission. In the update for partial missions I note what happens when you upload an empty mission https://github.com/mavlink/mavlink-devguide/pull/157/files#diff-17277822f661b48f9c95c6f034ab0469R166

[julianoes]

Thanks @hamishwillee !

[douglaswsilva]

Should we close this?

[julianoes]

Thanks @douglaswsilva yes.