Exchange Position was sending exact position when channel settings were different

[RaspberryProgramming]

There was an issue I noticed with the Exchange Position functionality where it would send my exact position to the mesh when my position was disabled or when the precision was modified. I hadn't opened an issue as I already discovered where this is happening.

The issue

In the android app when the user activated the Exchange Position button, a POSITION_APP packet is generated and sent by the android app. This is different from the firmware which would have sent an imprecise position based on the precision setting of that channel or would not include position if disabled on the channel.

I replicated how the firmware generates POSITION_APP packets to ensure that this functions similarly.

Testing

After making the change I built and ran the app on my phone, connected to a node and set the primary channel precision to 13.

You can see that the position app with precision 13 was sent and I also received a response from the destination.

I then sent the request with position disabled on my primary channel.

You can see that the request was sent without the position and a response was received.

I ran the unit tests via android studio and ran the other gradle commands required by the contribution guide.

[CLAassistant]

All committers have signed the CLA.

[Copilot]

Pull request overview

This PR fixes a privacy vulnerability in the Exchange Position functionality where the Android app was sending exact GPS coordinates regardless of channel precision settings or position-sharing preferences. The fix replicates the firmware's position precision masking algorithm to ensure that imprecise positions are sent based on channel settings.

Key Changes:

• Adds position precision masking logic that respects channel-specific precision settings
• Supports sending no position data when precision is set to 0 (position disabled)
• Applies bit masking and offset calculations to reduce position accuracy based on precision value

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