The Cardputer Zero's Cap carries a GPS on the header's UART, which the
device screen listed as "~ n/a" (pyserial's name for a port with no USB
identity): a companion to connect to, and with nothing remembered, the
lone port a command-line connect would pick. A wiring now names its
board's GPS (`gps_port`, `gps_baud`; the Cap's is /dev/serial0 at
115200), and wherever that radio is listed, its GPS port is not: the
device screen, `meshterm devices`, and autodetect.
The radio node reads it the way MeshCore companion firmware reads a
board's GPS: `gps` (off until switched on, remembered in prefs.json)
and `gps_interval` (0, every fix, once a second), reported and set as
custom variables, which is where Device config already shows them. A
valid RMC or GGA fix becomes the node's position, the one its
self-info reports and, with Share location on, its adverts carry. The
last fix is saved as the node shuts down. Standard library only, as
the node's contract asks; NMEA checksums are checked.
On MeshTerm's side, our own self-info is now refreshed behind the
answer after a minute, like the contacts, so screens opened after the
node moves show where it is; and the connect-time settings offer no
longer flags a position the running GPS moved.
Checked on the Cardputer: the ttyS0 row is gone from `meshterm
devices`; `config custom gps 1` opens the port, is saved, and reads
back on; the real-terminal test passes there.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Jean-Pierre MartineauandClaude Opus 5.5
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