The serial command buffers must stay NUL-terminated within their
bounds: if they ever aren't, strlen() can return >= sizeof(command)
and the read loop would index past the buffer. Additionally, a full
buffer now becomes a completed line (end-of-line marker placed
inside the buffer, NUL terminator kept) instead of overwriting the
terminator and silently corrupting the buffer for the next pass.
Applies to the serial CLI readers of the repeater, room server,
sensor and secure chat examples, and to the CLI rescue reader of
the companion example.
* Sensor, anon_req now just for admin login (guest password now unused)
* special CLI command, "setperm {pubkey-hex} {permissions-int16}" for admin(s) to manage user access (permissions 0 = remove)
João Brázio