LR1262 LoRaWAN AT Command Description

Sum Up¶

It mainly introduces the AT commands for LR1262 module communication in the field of Internet of Things, including configuration, operation, data sending and receiving of LoRa modules.

1. Terms, definitions and acronyms¶

Terms and definitions¶

• LoRa

LoRa is one of the LPWAN communication technologies, which is an ultra-long-range wireless transmission solution based on spread spectrum technology adopted and promoted by Semtech.

Features: low power consumption, long distance, low cost.

• LoRaWAN

The LoRa Alliance is an open, non-profit organisation founded in March 2015, led by Semtech. The Alliance published a low-power WAN standard based on an open source MAC layer protocol: the LoRaWAN protocol standard.

Network topology: Star structure.

Network Composition: LoRa Module, Gateway, Server (including Network Server, Network Control and Application Server).

LoRaWAN classifies LoRa modules into A/B/C categories.

Acronyms¶

2. Functional overview¶

The TE (Terminal Equipment) can control the functions of the MT (Mobile Terminal) and related network services by sending the AT commands described in this document. Terminal Agent (TA) performs the command and message adaptation function between the terminal equipment and the mobile equipment.

The physical realisation of the TE, TA and MT can be as follows:

• TE, TA and MT are three separate entities;
• TE is a separate entity and TA is integrated inside MT;
• MT is a separate entity and the TA is integrated inside the TE;
• TE, TA and MT are integrated into one entity.

In this document, TE is the MCU module of the IoT device and TA is the communication module and is integrated inside MT. Communication module means LoRa communication module.

The system structure of the terminal equipment (TE), terminal adapter (TA) and mobile terminal (MT) and the basic flow of establishing the association among them are shown in Fig.

According to the picture, we can see that the MCU module and the communication module are integrated together in the IoT device, and the MCU communicates with the TA through AT commands to control the MT (ME refers to mobile equipment) and realise the interaction between the IoT device and the cloud.

The interaction with the cloud is carried out through LoRa. In this document, the standard AT commands are extended to support LoRa commands, etc., so as to realise the message interaction between the IoT device and the cloud.

AT Command Syntax¶

The AT command uses an ASCII-based command line with the following command format:

The request message format is: AT+[OP][para-1,para-2,......para-n]

Response message format is <\r\n>[+CMD:][para-1,para-2,......para-n]<\r\n> or <\r\n><\r\n>, or both of the above

Clarification¶

(1) <>: Indicates what must be included.

(2) [ ]: indicates optional content.

(3) \r: carriage return terminator, ASCII code is 0x0D

(4) \n: Line feed character, ASCII code is 0x0A.

(5) For example, to query the connection mode of MQTT, send the command as:

• AT+IMQTTMODE?\r

(7) The reply message is:

• \r\n+IMQTTMODE:1\r\n

• \r\nOK\r\n

Note: \r\n is hidden in the following text for ease of reading¶

(1). Parameter configuration of serial port:

• baud rate 115200, data bit 8, stop bit 1, parity bit 0.

(2). The current commands support back display, temporarily do not support BackSpace, temporarily do not support back flip history commands.

Sample program description¶

1. Jumper connection¶

The LORAWAN_AT project uses a low-power serial port for reception, a power supply section, a reset button, an antenna and a USB connection.

2. Code location (to be added later)¶

3. Serial port settings¶

The serial port configuration information is as follows:

Baud rate: 9600 
Data bits: 8 
Stop bits: 1 
Parity: None 
Flow Control: None

4.Example¶

The following is an example of the steps to configure the network entry using the AT command for node A:

(1) Node A Information

DevEui: 70B3D57ED005B7FF
AppEui: 0000000000000003

AppKey: A8D7E5959F7746D902BF52BA2F899E3E
Node Type: ClassA 
Gateway Frequency Group Mask: 0001

(2) Setting Channel Mode

AT+ChannelMode=1

(3) Set the node entry frequency band

AT+BAND=8 (8 is 915 frequency band)

(4) Node triad information configuration

AT+DevEui=70B3D57ED005B7FF
AT+AppEui=0000000000000003
AT+AppKey=A8D7E5959F7746D902BF52BA2F899E3E

(5) Start networking

AT+JOIN=1,8

(6) Send data

AT+SEND=1:1:223333

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AT command commands¶

Key, ID and EUL Management Commands¶

LoRaWAN join and send data commands¶

LoRaWAN network management commands¶

Radio Test Command¶

Added command¶