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LGT-92 LoRaWAN GPS Tracker User Manual
Document Version: 1.0
Image Version: v1.3
Version
Description
Date
1.0
Release
2018-Dec-12
1.0.1
Correct GPS payload format in TTN
2019-Jan-23
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1. Introduction .............................................................................................................................. 4
1.1 What is LGT-92 LoRa GPS Tracker .............................................................................................. 4
1.2 Specifications .............................................................................................................................. 5
1.3 Features ...................................................................................................................................... 6
1.4 Applications ................................................................................................................................ 6
2. Use LGT-92 with stock LoRaWAN firmware ............................................................................... 7
2.1 How it works? ............................................................................................................................. 7
2.2 Quick guide to connect to LoRaWAN server (OTAA) ................................................................... 7
2.3 Uplink Payload .......................................................................................................................... 10
2.3.1 Payload Analyze .............................................................................................................. 10
2.3.2 Add Payload format in TTN ............................................................................................. 10
2.4 Downlink Payload ..................................................................................................................... 12
2.5 Firmware Change Log............................................................................................................... 12
3. Use AT Command .................................................................................................................... 13
3.1 Access AT Command ................................................................................................................. 13
3.2 Common AT Command Sequence ............................................................................................. 15
3.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ...................................................... 15
3.2.2 Single-channel ABP mode (Use with LG01/LG02) ........................................................... 15
4. Upload Firmware .................................................................................................................... 16
5. Developer Guide ..................................................................................................................... 18
5.1 Source Code .............................................................................................................................. 18
5.2 Compile Source Code ................................................................................................................ 18
5.2.1 Set up Keil compile environment .................................................................................... 18
5.2.2 Install STM32L0 Series Device......................................................................................... 21
5.2.3 Compile Source Code ...................................................................................................... 22
6. FAQ ......................................................................................................................................... 23
6.1 Why there is 433/868/915 version? ......................................................................................... 23
6.2 What is the frequency range of LT LoRa part? ......................................................................... 24
6.3 How to change the LoRa Frequency Bands/Region? ................................................................ 25
6.4 Can I use Private LoRa protocol? .............................................................................................. 25
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6.5 How to set up LGT-92 to work in 8 channel mode in US915, AU915, CN470 bands? ............... 26
6.6 What is the pin mapping for the USB program cable? ............................................................. 26
6.7 How to set up LGT-92 to work with Single Channel Gateway such as LG01/LG02? ................. 27
7. Order Info ............................................................................................................................... 29
8. Packing Info ............................................................................................................................ 29
9. Support ................................................................................................................................... 29
10. Reference ................................................................................................................................ 30
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1. Introduction
1.1 What is LGT-92 LoRa GPS Tracker
LGT-92 is a Long Range / low power consumption LoRaWAN GPS tracker. LGT-92 get user’s
location info via GPS and send it to IoT server via LoRaWAN wireless network.
Compare to traditional GPS tracker, LGT-92 use much lower power consumption hence can last
for longer time. It doesn’t need cellular service; system integrator can build their own tracking
network base on LoRa technology.
LGT-92 uses STM32l0x chip from ST, STML0x is the ultra-low-power STM32L072xx
microcontrollers incorporate the connectivity power of the universal serial bus (USB 2.0
crystal-less) with the high-performance ARM® Cortex®-M0+ 32-bit RISC core operating at a 32
MHz frequency, a memory protection unit (MPU), high-speed embedded memories (192 Kbytes
of Flash program memory, 6 Kbytes of data EEPROM and 20 Kbytes of RAM).
LGT-92 includes a low power GPS module L70 and 9-axis accelerometer for motion and attitude
detection. The power for both of the GPS module and accelerometer can be controlled by MCU
to achieve the best energy profile for different applications.
LGT-92 is powered by 1000mA Li-on battery, user can program the device to work from weeks to
months depends on the target use case.
LGT-92 is an open source product, it is based on the STM32Cube HAL drivers and lots of libraries
can be found in ST site for rapid development.
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1.2 Specifications
Micro Controller:
STM32L072CZT6 MCU
MCU: STM32L072CZT6
Flash:192KB
RAM:20KB
EEPROM: 6KB
Clock Speed: 32Mhz
Common DC Characteristics:
Supply Voltage: 2.1v ~ 3.6v
Operating Temperature: -40 ~ 85°C
LoRa Spec:
Frequency Range,
Band 1 (HF): 862 ~ 1020 Mhz
or
Band 2 (LF): 410 ~ 528 Mhz
168 dB maximum link budget.
+20 dBm - 100 mW constant RF output vs.
+14 dBm high efficiency PA.
Programmable bit rate up to 300 kbps.
High sensitivity: down to -148 dBm.
Bullet-proof front end: IIP3 = -12.5 dBm.
Excellent blocking immunity.
Low RX current of 10.3 mA, 200 nA register retention.
Fully integrated synthesizer with a resolution of 61 Hz.
FSK, GFSK, MSK, GMSK, LoRaTM and OOK modulation.
Built-in bit synchronizer for clock recovery.
Preamble detection.
127 dB Dynamic Range RSSI.
Automatic RF Sense and CAD with ultra-fast AFC.
Packet engine up to 256 bytes with CRC.
LoRaWAN 1.0.2 Specification
Battery:
1000mAh Li-on rechargeable battery
Power Consumption
Sleeping Mode: 77uA
LoRa Transmit Mode: 125mA @ 20dBm 44mA @ 14dBm
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Tracking: max: 38mA
1.3 Features
LoRaWAN 1.0.2 Class A,Class C
STM32L072CZT6 MCU
SX1276/78 Wireless Chip
Pre-load bootloader on USART1/USART2
MDK-ARM Version 5.24a IDE
Preamble detection
Frequency bands CN470/EU433/KR920/US915/IN865
EU868/AS923/AU915
Open source hardware / software
Regular/ Real-time GPS tracking
Built-in 9 axis accelerometer (MPU9250)
Motion sensing capability
Power Monitoring
Charging clip with USB port
1000mA Li-on Battery power
Tri-color LED, Alarm button
1.4 Applications
Smart Buildings & Home Automation
Logistics and Supply Chain Management
Significant Assets management.
Human tracking
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2. Use LGT-92 with stock LoRaWAN firmware
2.1 How it works?
The LGT-92 is pre-loaded with a firmware and is configured as LoRaWAN OTAA Class A mode by
default. It has OTAA keys to join LoRaWAN network. To connect a local LoRaWAN network, user
just need to input the OTAA keys in the LoRaWAN IoT server and power on the LGT-92. It will auto
join the network via OTAA.
In case user can’t set the OTAA keys in the LoRaWAN OTAA server and has to use the keys from
the server. User can use AT Command to set the keys in LGT-92.
2.2 Quick guide to connect to LoRaWAN server (OTAA)
Here is an example for how to join the TTN LoRaWAN Network. Below is the network structure,
we use LG308 as LoRaWAN gateway in this example.
The LG308 is already set to connect to TTN network . So what we need to now is only configure
the TTN:
Step 1: Create a device in TTN with the OTAA keys from LGT-92.
Each LGT-92 is shipped with a sticker with the default device EUI as below:
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User can enter this key in their LoRaWAN Server portal. Below is TTN screen shot:
Add APP EUI in the application
Add APP KEY and DEV EUI
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Step 2: Power on LGT-92 LoRaWAN GPS Tracker
Step 3: LGT-92 will auto join to the TTN network. After join success, LGT92 will start to upload
message to IoT server.
By default, the upload period is 5 minutes. In the start of each period, LGT-92 will try to get GPS
signal and the green LED will blink. Once LGT-92 get the GPS info, it will upload a LoRa message
include battery / GPS info/ X,Y axis info. If LGT-92 can’t get GPS info into 2 minutes, it will still
upload the message but the GPS info will be all 00.
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2.3 Uplink Payload
2.3.1 Payload Analyze
The uplink payload includes totally 12 bytes. Uplink packets use FPORT=2 and every 5 minutes
send one uplink by default.
Size(bytes)
3 3 2 2 2
Value
Latitude
Longitude
BAT X Y
Example:
Latitude: 06765f ⇒ if (0x06765f & 0x800000 = 0 ): value = 0x06765f /10000 = 42.3519
Longitude: F2960a ⇒ if (0xF2960a & 0x800000 = 1 ):
value = (0xf2960a – 0x 1000000)/10000 -87.9094
BAT: Ex1: 0x0B45 ⇒ 3850mV
X: 04D2 = if (0x04D2 & 0x8000 = 0 ): value = 0x04D2 / 1000 = +1234 ⇒ +1.234G
Y: FB2E =if (0xFB2E & 0x8000 = 1 ): value =( 0xFB2E - 0x10000)/1000(dec)
⇒
-1.234G
2.3.2 Add Payload format in TTN
In TTN, use can add a custom payload so it shows friendly.
In the page Applications --> Payload Formats --> Custom --> decoder
Add below code:
//The function is :
function Decoder(bytes, port) {
// Decode an uplink message from a buffer
// (array) of bytes to an object of fields.
var value=bytes[0]<<16 | bytes[1]<<8 | bytes[2];
if(bytes[0] & 0x80)
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{
value |=0xFFFFFF000000;
}
var latitude=value/10000;//gps latitude
value=bytes[3]<<16 | bytes[4]<<8 | bytes[5];
if(bytes[3] & 0x80)
{
value |=0xFFFFFF000000;
}
var longitude=value/10000;//gps longitude
value=bytes[6]<<8 | bytes[7];
var batV=value/1000;//Battery,units:V
value=bytes[8]<<8 | bytes[9];
var roll=value/100;//
value=bytes[10]<<8 | bytes[11];
var pitch=value/100;
return {
Latitude: latitude,
Longitud: longitude,
Roll: roll,
Pitch:pitch,
BatV:batV,
};
}
Save the change the uplink message will be parsed. As below:
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2.4 Downlink Payload
2.5 Firmware Change Log
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3. Use AT Command
3.1 Access AT Command
LGT-92 supports AT Command set in stock firmware. User can use a USB to TTL adapter to
connect to LGT-92 for using AT command, as below.
In PC, User needs to set serial tool baud rate to 9600 to access serial console for LGT-92. LGT-92
will output system info once power on and user will be able to send AT commands:
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Below are the available commands, a more detail AT Command manual can be found at AT
Command Manual
AT+<CMD>? : Help on <CMD>
AT+<CMD> : Run <CMD>
AT+<CMD>=<value> : Set the value
AT+<CMD>=? : Get the value
General Command
AT: Attention
AT?: Short Help
ATZ: MCU Reset
AT+TDC: Application Data Transmission Interval
Keys,IDs and EUIs management
AT+APPEUI: Application EUI
AT+APPKEY: Application Key
AT+APPSKEY: Application Session Key
AT+DADDR: Device Address
AT+DEUI: Device EUI
AT+NWKID: Network ID(You can enter this command change only after successful network
connection)
AT+NWKSKEY: Network Session Key
Joining and sending date on LoRa? network
AT+CFM: Confirm Mode
AT+CFS: Confirm Status
AT+JOIN: Join LoRa? Network
AT+NJM: LoRa? Network Join Mode
AT+NJS: LoRa? Network Join Status
AT+RECV: Print Last Received Data in Raw Format
AT+RECVB: Print Last Received Data in Binary Format
AT+SEND: Send Text Data
AT+SENB: Send Hexadecimal Data
LoRa network management
AT+ADR: Adaptive Rate
AT+CLASS: LoRa Class(Currently only support class A
AT+DCS: Duty Cycle Setting
AT+DR: Data Rate (Can Only be Modified after ADR=0)
AT+FCD: Frame Counter Downlink
AT+FCU: Frame Counter Uplink
AT+JN1DL: Join Accept Delay1
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AT+JN2DL: Join Accept Delay2
AT+PNM: Public Network Mode
AT+RX1DL: Receive Delay1
AT+RX2DL: Receive Delay2
AT+RX2DR: Rx2 Window Data Rate
AT+RX2FQ: Rx2 Window Frequency
AT+TXP: Transmit Power
Information
AT+RSSI: RSSI of the Last Received Packet
AT+SNR: SNR of the Last Received Packet
AT+VER: Image Version and Frequency Band
AT+FDR: Factory Data Reset
AT+PORT: Application Port
AT+CHS: Get or Set Frequency (Unit: Hz) for Single Channel Mode
AT+CHE: Get or Set eight channels mode, Only for US915, AU915, CN470
3.2 Common AT Command Sequence
3.2.1 Multi-channel ABP mode (Use with SX1301/LG308)
If device has not joined network via OTAA:
AT+FDR
AT+NJM=0
ATZ
If device already joined network:
AT+NJM=0
ATZ
3.2.2 Single-channel ABP mode (Use with LG01/LG02)
AT+FDR Reset Parameters to Factory Default, Keys Reserve
AT+NJM=0 Set to ABP mode
AT+ADR=0 Set the Adaptive Data Rate Off
AT+DR=5 Set Data Rate
AT+TDC=300000 Set transmit interval to 5 minutes
AT+CHS=868400000 Set transmit frequency to 868.4Mhz
AT+DADDR=26 01 1A F1 Set Device Address to 26 01 1A F1
ATZ Reset MCU
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4. Upload Firmware
User can use the LGT-92’s USB port to upgrade firmware into it. The hardware connection for
upgrade firmware is as below:
Connection:
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
LGT-92 power can be on or off.
Step1: Install ST-LINK driver first and then install ST-LINK Utility
Step2: Download the LGT-92 Image files.
Step3: Open ST-LINK utility, file --> open file to select the image to be upgraded.
Step4: Keep pushing the small reset button on LGT92 and then click the “Program Verify” button
on ST-LINK.
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Step5: The led on the ST-LINK adapter will now blinking, once see it blinking; release the reset
button on the LGT-92.
Step6: The led on the ST-LINK adapter will now blinking, once see it blinks; release the reset
button on the LGT-92. The ST-Link utility will pop up a download window. Click the start button to
download the image to LGT-92.
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5. Developer Guide
5.1 Source Code
Software Source Code Download Link.
Hardware Source Code Download Link
5.2 Compile Source Code
5.2.1 Set up Keil compile environment
Assume you already have Keil uVision5 installed. Below step shows how to install MDK support and get license.
1: Open the web: http://www2.keil.com/stmicroelectronics-stm32/mdk
2: Download the keil:
3: Login with an account that has administration rights.
4: Right-click the µVision icon and select Run as Administrator... from the context menu.
5: Open the dialog File — License Management... and select the Single-User License tab.
6: Click the button Get LIC via Internet..., then click the button OK to register the product. This action opens the
License Management page on the Keil web site.
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7: Enter the Product Serial Number 4PPFW-QBEHZ-M0D5M along with your contact information and click the
button Submit. An e-mail is sent back with the License ID Code (LIC) within a few minutes.
(1)
(2)
(3)
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8:To activate the Software Product, enter the LIC in the field New License ID Code (LIC) of the dialog License
Management... and click Add LIC.
9:Finish
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5.2.2 Install STM32L0 Series Device
1:Open the web:http://www.keil.com/dd2/pack/eula-container;
2:Find the STMicroelectronics STM32L0 Series Device and download it;
3:Find the Software Pack and installs it;
4:Add the Device ,then you can rebuild the project.
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Notice: If without add the Device, the keil would report this error.
5.2.3 Compile Source Code
1. Download the source code from Software Source Code Download Link.
2. Use Keil to open the project file:
STM32CubeExpansion_LRWAN/Projects/Multi/Applications/LoRa/DRAGINO-LRWAN(AT)/MD
K-ARM/STM32L072CZ-Nucleo/Lora.uvprojx
3. In Keil, you can see what frequency band the code support.
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4. If you want to change frequency, modify the Preprocessor Symbols. For example, change
EU868 to US915
5. Compile and build
6. FAQ
6.1 Why there is 433/868/915 version?
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Different country has different rules for the ISM band for using the LoRa. Although the LoRa chip
can support a wide range of Frequency, we provide different version for best tune in the LoRa
part. That is why we provide different version of LoRa.
6.2 What is the frequency range of LT LoRa part?
Different LT version supports different frequency range, below is the table for the working
frequency and recommend bands for each model :
Version
LoRa IC
Working Frequency
Best Tune
Frequency
Recommend Bands
433
SX1278
Band2(LF): 410 ~525 Mhz
433Mhz
CN470/EU433
868
SX1276
Band1(HF):862~1020 Mhz
868Mhz
EU868
915
SX1276
Band1(HF):862 ~1020 Mhz
915Mhz
AS923/AU915/
KR920/US915
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6.3 How to change the LoRa Frequency Bands/Region?
User can follow the introduction for how to upgrade image. When download the images, choose
the required image file for download.
6.4 Can I use Private LoRa protocol?
The stock firmware is based on LoRaWAN protocol. User can use a private LoRa protocol in
LGT-92, this section describe an example for base LoRa transfer. It is a reference/demo and we
didn’t provide further software develop support on this topic.
In this demo, we will show the communication between LoRa Shield and LGT-92, both of them
use the basic LoRa library. LGT-92 will send a message to LoRa Shield and LoRa Shield will print it
to the console.
LoRa Shield + UNO:
Use the <LoRa Library> and upload the LoRa_Receive Sketch to Arduino. Open the serial
monitor to Arduino, it acts as a LoRa Receiver and listen on the frequency: 868.3Mhz
LGT-92:
Use the <LoRa RAW code> . The project file is in: MDK-ARM\STM32L072CZ-Nucleo\
Lora.uvprojx
Compile it and Upload it to LGT-92, the LGT-92 will transfer on the frequency 868.3Mhz.
In Arduino Console, it will see:
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6.5 How to set up LGT-92 to work in 8 channel mode in US915, AU915, CN470
bands?
By default, the frequency bands US915, AU915, CN470 works in 72 frequencies. And many
gateways is 8 channel gateways, in such case, the OTAA joined time and uplink schedule is long
and unpredictable while the LGT-92 hopping in 72 frequency.
User can configure the LGT-92 to work in 8 channel models by using the AT+CHE command. For
example, in US band, the table is as below. If we run AT+CHE=2. The device will work in Channel
8-15
CHE
US915 Uplink Channels(125KHz,4/5,Unit:MHz,CHS=0)
0
ENABLE Channel 0-63
1
902.3
902.5
902.7
902.9
903.1
903.3
903.5
903.7
Channel 0-7
2
903.9
904.1
904.3
904.5
904.7
904.9
905.1
905.3
Channel 8-15
3
905.5
905.7
905.9
906.1
906.3
906.5
906.7
906.9
Channel 16-23
4
907.1
907.3
907.5
907.7
907.9
908.1
908.3
908.5
Channel 24-31
5
908.7
908.9
909.1
909.3
909.5
909.7
909.9
910.1
Channel 32-39
6
910.3
910.5
910.7
910.9
911.1
911.3
911.5
911.7
Channel 40-47
7
911.9
912.1
912.3
912.5
912.7
912.9
913.1
913.3
Channel 48-55
8
913.5
913.7
913.9
914.1
914.3
914.5
914.7
914.9
Channel 56-63
6.6 What is the pin mapping for the USB program cable?
Pin
Color
USB Pin
UART pin
ST-Link Pin
1
Red
VCC
N/A
+5V
2
White
D- (N/A)
LGT-RXD
SWDIO
3
Green
D+(N/A)
LGT-TXD
SWCLK
4 ID (N/A)
N/A 5
Black
GND
GND
GND
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6.7 How to set up LGT-92 to work with Single Channel Gateway such as LG01/LG02?
In this case, users need to set LGT-92 to work in ABP mode & transmit in only one frequency.
Assume we have a LG02 working in the frequency 868400000 now, below is the steps.
Step1: Log in TTN, Create an ABP device in the application and input the network session key
(NETSKEY), app session key (APPSKEY) from the device.
Note: user just need to make sure above three keys match, User can change either in TTN or Device to make then
match. In TTN, NETSKEY and APPSKEY can be configured by user in setting page, but Device Addr is generated by
TTN. User can also change the Device ADDR in TTN by using the The Things Network CLI.
Step2: Run AT Command to make LGT-92 work in Single frequency & ABP mode. Below is the AT
commands:
AT+FDR Reset Parameters to Factory Default, Keys Reserve
AT+NJM=0 Set to ABP mode
AT+ADR=0 Set the Adaptive Data Rate Off
AT+DR=5 Set Data Rate (Set AT+DR=3 for 915 band)
AT+TDC=300000 Set transmit interval to 5 minutes
AT+CHS=868400000 Set transmit frequency to 868.4Mhz
AT+DADDR=26 01 1A F1 Set Device Address to 26 01 1A F1
ATZ Reset MCU
As shown in below:
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7. Order Info
Part Number: LGT-92-xx
XX: The default frequency band
AS923: LoRaWAN AS923 band
AU915: LoRaWAN AU915 band
EU433: LoRaWAN EU433 band
EU868: LoRaWAN EU868 band
KR920: LoRaWAN KR920 band
US915: LoRaWAN US915 band
IN865: LoRaWAN IN865 band
CN470: LoRaWAN CN470 band
8. Packing Info
Package Includes:
LGT-92 LoRa GPS Tracker x 1
USB recharge cable x 1
USB program cable x 1
Dimension and weight:
Device Size: 85 x 48 x 15 cm
Device Weight: 50g
9. Support
Support is provided Monday to Friday, from 09:00 to 18:00 GMT+8. Due to different
timezones we cannot offer live support. However, your questions will be answered as soon
as possible in the before-mentioned schedule.
Provide as much information as possible regarding your enquiry (product models, accurately
describe your problem and steps to replicate it etc) and send a mail to
support@dragino.com
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10. Reference
Product Page , DataSheet
Image Download
AT Command Manual
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