Arduino library for building LTE-M/NB-IoT prototypes with Quectel LPWA modules.

Get a GPS fix, publish it over MQTT, and go to sleep — in under 60 lines of code.

The included TrackerDemo builds a complete low-power GPS tracker:

1. Download AGNSS aiding data for fast time-to-first-fix
2. Acquire GPS position (typically < 10s with AGNSS)
3. Publish location as JSON over MQTT
4. Enter PSM/eDRX sleep to conserve battery
5. Wake up and repeat

• Arduino dev board (ESP-WROOM-32 was used for testing)
• Quectel LPWA TE-B evaluation board (see supported modules)
• Active LTE-M SIM card
• Arduino CLI or Arduino IDE

ESP32          Quectel TE-B
─────────────────────────
D25      →     RXD
D26      →     TXD
D27      →     DTR
D33      →     PON_TRIG
GND      →     GND

On the Quectel TE-B, set PON_TRIG → OFF and AUTO_POWER_ON → ON, and remove resistor R0413.

Subscribe to the MQTT topic from any machine:

mosquitto_sub -h broker.emqx.io -t "lpwa/tracker/location" -v

All settings have sensible defaults. Override them before calling configure():

LPWA.config.module = BG950A;

// Network bands (default: US bands 2,4,5,12,13,25,26 + EU band 20)
LPWA.config.catm_bands  = "308181A";

// Power saving
LPWA.config.psm_t3324   = "00000010";   // Active timer: 2s
LPWA.config.psm_t3412   = "00100001";   // Periodic TAU: 1h
LPWA.config.edrx_cycle  = "1100";       // eDRX cycle: ~22 min
LPWA.config.edrx_ptw    = "0011";       // Paging window: 5.12s

The library uses HardwareSerial and standard digitalWrite/digitalRead. Any board with a free UART and 3.3V logic should work. Pass your pin assignments to LPWA.begin().