Connect doesn't start until "Timeout in 7s"

#### Issue details

When connecting to the drone, it is not until 23s after and the pop up window showing "Timeout in 7s" that we finally start receiving telemetry and downloading the params. It is systematically the same behavior, nothing happens before it shows "7s".

#### Version
1.3.68.1

#### Platform
[X] All
[ ] AntennaTracker
[ ] Copter
[ ] Plane
[ ] Rover
[ ] Sub

#### Hardware type
PX4

Reproduce the connection flow in Mission Planner 1.3.68.1 with PX4 hardware, using the report's observation that telemetry and parameter downloads begin only when the "Timeout in 7s" popup appears. Compare the connection timing before and after that point; done means telemetry and parameters start without the reported 23-second delay.

Written by the indexing model from the issue text.