Raspberry Pi GNSS NTP & RTK Server Project

Main Target: Arch Linux ARM on Raspberry Pi 3B+ with minimal external hardware.

Files

File	Purpose
config.txt	Raspberry Pi boot config (UART, etc.)
cmdline.txt	Kernel command line parameters
chrony.conf	NTP configuration excerpt using GNSS PPS
rtkserv.sh	RTKLib str2str startup script for NTRIP caster
daily-ubx.sh	Collect raw UBX data daily (executed by cron)
neoubxlogger/	C++ UBX protocol logger

neoubxlogger — C++ UBX Protocol Logger

The original C++ implementation in neoubxlogger/.

Build

cd neoubxlogger
make setup    # one-time: create .venv with Python codegen deps
make          # codegen + compile + link

Usage

# Read from file, passthrough to daily output
./neoubxlogger < input.ubx

# Read from file, no write
./neoubxlogger -f input.ubx -n

# TCP stream (auto-reconnects on disconnect)
./neoubxlogger -t 192.168.1.100:5555 -n

# TCP + quiet daemon mode (per-minute stats only)
./neoubxlogger -t 192.168.1.100:5555 -n -q

# Debug output (single-line dump every frame)
./neoubxlogger -f input.ubx -d

Options

Flag	Description
-f FILE	Read from .ubx file (default: stdin)
-t HOST:PORT	Read from TCP socket (auto-reconnects)
-n	No write — passthrough to file disabled
-d	Debug — dump every frame to stderr (single-line format)
-q	Quiet daemon mode — suppress status line, show per-minute stats only

-f and -t are mutually exclusive. -d and -q are mutually exclusive.

Example daemon invocation

./neoubxlogger -t gnss-receiver.local:5555 -n -q

Output:

Connected to gnss-receiver.local:5555
[neoubxlogger stats] avg rate: 12.3 KiB/s, frames: 452, FIX 100%
[neoubxlogger stats] avg rate: 11.8 KiB/s, frames: 438, FIX 100%
...