View source for LGT-92

{{Project
 |Name=LGT-92
 |Picture=Lgt92.jpg
 |Omschrijving=Improving LGT-92 LoRaWAN tracker software
 |Status=Initializing
 |Contact=bertrik
}}

== What ==
This page is about the Dragino LGT-92, a GPS-enabled LoRaWAN tracker node.

The plan is to investigate if the firmware can be improved, e.g.:
* fix minor existing bugs
** see the Issues page at github
* add Cayenne encoding
* collect information on how to interface with it (over the "USB" port)
* perhaps write a replacement firmware, that can be easily compiled with platformio

== Hardware ==
As far as I understand:
* STM32L151 microcontroller, could also be STM32L072 I can't get this really clear
* GPS
* accelerometer, MPU9250?
* button, 3 LEDs (R, G, B)
* 1000 mAh battery + charging circuit

Information provided by Dragino: https://github.com/dragino/Lora/tree/master/LGT-92

== Software ==
Dragino binary firmware downloads: https://www.dragino.com/downloads/downloads/LGT_92/firmware/

My fork of the Dragino firmware: https://github.com/bertrik/LGT-92_-LoRa_GPS_Tracker

Work in progress for an Arduino firmware: https://github.com/bertrik/lgt92

=== Flashing ===
When you hold the reset pin (e.g. push a dupont-pin in the hole next to the USB connector), you can communicate over SWCLK/SWDIO debug pins.

ST-Link pin connections (from: https://github.com/dragino/LGT-92_-LoRa_GPS_Tracker/issues/10):
  ST-LINK v2 5.0v  <--> Dupont red pin
  ST-LINK v2 GND   <--> Dupont black pin
  ST-LINK v2 SWCLK <--> Dupont green pin
  ST-LINK v2 SWDIO <--> Dupont white pin

For example:
  openocd -f /usr/share/openocd/scripts/interface/stlink.cfg -f /usr/share/openocd/scripts/target/stm32l0.cfg

=== TTN mapper configuration ===
Run these commands to set it up with ABP keys, ADR off, uplink at SF7 every 15 seconds:
  AT+ADR=0
  AT+NJM=0
  AT+CFM=0
  AT+DR=5
  AT+LON=1
  AT+MD=0
  AT+DADDR=26 01 1A 30
  AT+NWKSKEY=FB 09 6B 85 86 AF 47 12 E8 AE 67 CB 7F A9 CB 51
  AT+APPSKEY=CB 9B 8F F5 E6 2C 8E 87 9E 0B 6B 1F 4B 69 14 FA
  AT+TDC=15000
  AT+NMEA886=2
  AT+PORT=1
  AT+FTIME=0