MeshOS - missing method to add a private channel key and exchange private channel messages

[mwmaher]

Problem: MeshOS on T-Deck currently has no UI to enter a per-channel secret key. This prevents joining and creating private channels compatible with MeshCore clients that use a channel key.

Why it matters: Enables private group messaging on-device (not just DMs), interoperability with iOS/Android/Web clients, and parity with common MeshCore channel workflows.

Requested capability

• Ability to create/edit a MeshCore private channel.
• Ability to send/receive on that private channel.

Suggested UI:

• Settings → Channels → Add/Edit
• MeshCore Terminal: Command for adding a channel number, name, and key
• Fields: Channel number, channel name, key

Acceptance criteria:

• A MeshOS device can exchange MeshCore private channel messages.

Device & firmware info:
Hardware: Lilygo T-Deck Plus
MeshOS version: latest as of 2/8/2026

Steps tried:
I attempted to add a private channel via MeshOS on the Lilygo T-Desk Plus device.

• Settings --> Channels --> selected channel 2. This popped up Edit Channel 2 window with a "#" prompt.
• #-name could be entered.
• There was no prompt for entering a private channel key.

I also attempted to add a private channel using the MeshOS Terminal and the /setchannel command. The command provides no provision for specifying the private channel key.

• /setchannel <1-4> # (e.g. /setchannel 3 #Jokes)