Shipped LT-22222-L is base on LoRaWAN protocol. We also develop a open source Point to Point LoRa protocol for LT-22222-L. The source code and hex file can be found at:

Point to Point Software for LT-22222-L.

If the sender does not get the ACK reply from the receiver, it will retransmit up to 4 times, each interval is 6 seconds, and the UplinkCounter of the retransmission will not increase.

ATZ :            Trig a reset of the MCU

AT+FDR :     Reset Parameters to Factory Default, Keys Reserve

AT+FCU :     Get or Set the Frame Counter Uplink

AT+FCD :     Get or Set the Frame Counter Downlink

AT+TXP :     Get or Set the transmit power, the maximum is 20dBm (default is 14dBm)

AT+SYNC :  Get or Set the Sync word [1:0x34,0:0x12] (default is 1)

AT+PMB :    Get or Set the preamble (default:8)

AT+TXCHS : Get or Set the transmit frequency of TX (default:868700000)

AT+TXSF :    Get or Set the spreading factor of TX (7 to 12) (default:12)

AT+RXCHS : Get or Set the transmit frequency of RX (default:869000000)

AT+RXSF :    Get or Set the spreading factor of RX (7 to 12) (default:12)

AT+BW :       Get or Set the bandwidth [0:125khz,1:250khz,2:500khz] (default:0)

AT+CR :        Get or Set the coding rate [1: 4/5, 2: 4/6, 3: 4/7, 4: 4/8] (default:1)

AT+TDC :      Get or set the application data transmission interval in ms(default 10 minutes)

AT+VER :      Get firmware version number

AT+SEND :   Set Custom sent hex data

AT+GROUPMOD : Set or Get the grouping mode of the device (default: 0)

AT+TRIG1 :            Set or Get the DI1 pin interrupt trigger mode (default 0,0)

AT+TRIG2 :            Set or Get the DI2 pin interrupt trigger mode (default 0,0)

AT+DI1TODO1 :    Set or get the mode in which DI1 maps to DO1 (default 0)

AT+DI1TORO1 :    Set or get the mode in which DI1 maps to RO1(default 0)

AT+DI2TODO2 :    Set or get the mode in which DI2 maps to DO2(default 0)

AT+DI2TORO2 :    Set or get the mode in which DI2 maps to RO2(default 0)

Example 1:

AT+SEND=01020304 will send a payload of 01020304

Example 2: 

AT+TRIGx=a    Trigger directly without triggering time

AT+TRIGx=a,b 

a=0: falling edge;

a=1: rising edge;

a=2: falling edge or rising edge;

b:     triggering time in milliseconds.

AT+TRIGx=2,50  Falling edge or rising edge trigger, and the trigger time exceeds 50ms.

Example 3: 

AT+DI1TODO1= maps value

AT+DI1TORO1= maps value

AT+DI2TODO2= maps value

AT+DI2TORO2= maps value

Example 4: 

AT+GROUPMOD=0       Set to point to point mode

AT+GROUPMOD=0,aa  Set the TX group that controls the number of aa (The maximum value of aa is 8)

AT+GROUPMOD=0,2    Set to control the TX group of the two RX groups

AT+GROUPMOD=1,1    Set the RX group numbered 1

AT+GROUPMOD=1,2    Set the RX group numbered 2

8 bytes of GROUPID + 9 bytes of payload + 4 bytes of checksum

Payload:

The first byte:        00 is the broadcast address, 01-08 is the RX group number.

The second byte:   send mapping request when not 0, not request when it is 0.

The third byte:      ACK returned to the sender after the mapping is completed.

The Fifth byte:       DI1TODO1 when the interrupt is triggered, 0 when the interrupt is not triggered.

The Sixth byte:       0 does not trigger interrupt when DI1TORO1 interrupt is triggered.

The 8th byte:          DI2TODO2 when the interrupt is triggered, 0 when the interrupt is not triggered.

The 9th byte:          DI2TORO2 when an interrupt is triggered, 0 when an interrupt is not triggered.