Emacs chat client for MeshMonitor, a web-based Meshtastic network
monitor.  Provides channel and direct message chat buffers.

Configure `meshmonitor-chat-host', `meshmonitor-chat-port' and
`meshmonitor-chat-token' in your init file.  Then:

  M-x meshmonitor-chat                 - welcome screen
  M-x meshmonitor-chat-channels        - list channels
  M-x meshmonitor-chat-nodes           - list nodes by hops
  M-x meshmonitor-chat-unread          - nodes with unread DMs
  M-x meshmonitor-chat-direct-messages - list DM conversations