Wiki source code of Point to Point Communication of LT-22222-L

Version 11.2 by Xiaoling on 2022/06/02 14:33

version	line-number	content
1.1	1	{{box cssClass="floatinginfobox" title="Contents"}}
	2	{{toc/}}
	3	{{/box}}
	4
4.2	5	= 1. Overview =
1.1	6
6.1	7	(((
1.1	8	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:
6.1	9	)))
1.1	10
6.1	11	(((
1.1	12	[[Point to Point Software for LT-22222-L>>https://github.com/dragino/LT-22222-L]].
6.1	13	)))
1.1	14
	15	== ==
	16
4.2	17	= 2. Features for this firmware =
1.1	18
4.2	19
8.2	20	== 2.1 Point To Point ==
4.2	21
8.1	22
8.2	23	[[image:image-20220602111219-1.png\|\|height="472" width="972"]]
4.2	24
	25
8.2	26	(% class="wikigeneratedid" id="H2.2.Configure" %)
	27	(% style="color:blue" %)Configure:
4.2	28
4.3	29	(% border="1" style="background-color:#f7faff; color:black; width:500px" %)
	30	\|=A's configuration\|=B's configuration
	31	\|AT+GROUPMOD=0\|AT+GROUPMOD=0
	32	\|AT+TXCHS=868700000\|AT+TXCHS=869000000
	33	\|AT+RXCHS=869000000\|AT+RXCHS=868700000
	34	\|AT+TRIG1=2,50\|AT+TRIG1=2,50
	35	\|AT+TRIG2=2,50\|AT+TRIG2=2,50
	36	\|AT+DI1TODO1=2\|AT+DI1TODO1=2
	37	\|AT+DI1TORO1=2\|AT+DI1TORO1=2
	38	\|AT+DI2TODO2=2 \|AT+DI2TODO2=2
	39	\|AT+DI2TORO2=2\|AT+DI2TORO2=2
4.2	40
8.2	41	== 2.2 Point To Mult-Point ==
4.2	42
7.1	43
4.2	44	[[image:image-20220602111219-2.png]]
	45
	46
	47	[[image:image-20220602111219-3.png]]
	48
8.9	49	(((
4.2	50	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.
8.9	51	)))
4.2	52
8.2	53
	54	== 2.3 AT command ==
	55
	56
8.6	57	(% style="color:#037691" %)ATZ (%%): Trig a reset of the MCU
8.2	58
8.6	59	(% style="color:#037691" %)AT+FDR (%%): Reset Parameters to Factory Default, Keys Reserve
8.2	60
8.6	61	(% style="color:#037691" %)AT+FCU (%%): Get or Set the Frame Counter Uplink
8.2	62
8.6	63	(% style="color:#037691" %)AT+FCD (%%): Get or Set the Frame Counter Downlink
8.2	64
8.6	65	(% style="color:#037691" %)AT+TXP (%%): Get or Set the transmit power, the maximum is 20dBm (default is 14dBm)
8.2	66
8.8	67	(% style="color:#037691" %)AT+SYNC (%%): Get or Set the Sync word [1:0x34,0:0x12] (default is 1)
8.2	68
8.7	69	(% style="color:#037691" %)AT+PMB (%%): Get or Set the preamble (default:8)
8.2	70
8.6	71	(% style="color:#037691" %)AT+TXCHS (%%): Get or Set the transmit frequency of TX (default:868700000)
8.2	72
8.6	73	(% style="color:#037691" %)AT+TXSF (%%): Get or Set the spreading factor of TX (7 to 12) (default:12)
8.2	74
8.6	75	(% style="color:#037691" %)AT+RXCHS (%%): Get or Set the transmit frequency of RX (default:869000000)
8.2	76
8.6	77	(% style="color:#037691" %)AT+RXSF (%%): Get or Set the spreading factor of RX (7 to 12) (default:12)
8.2	78
9.2	79	(% style="color:#037691" %)AT+BW (%%): Get or Set the bandwidth [0:125khz,1:250khz,2:500khz] (default:0)
8.2	80
8.7	81	(% style="color:#037691" %)AT+CR (%%): Get or Set the coding rate [1: 4/5, 2: 4/6, 3: 4/7, 4: 4/8] (default:1)
8.2	82
8.6	83	(% style="color:#037691" %)AT+TDC (%%): Get or set the application data transmission interval in ms(default 10 minutes)
8.2	84
8.8	85	(% style="color:#037691" %)AT+VER (%%): Get firmware version number
8.2	86
9.2	87	(% style="color:#037691" %)AT+SEND (%%): Set Custom sent hex data
8.2	88
8.6	89	(% style="color:#037691" %)AT+GROUPMOD (%%): Set or Get the grouping mode of the device (default: 0)
8.2	90
11.1	91	(((
8.7	92	(% style="color:#037691" %)AT+GROUPID (%%): Set or Get the password for matching between TX group and RX group, which can be composed of numbers or characters (default: 12345678)
11.1	93	)))
8.2	94
8.6	95	(% style="color:#037691" %)AT+TRIG1 (%%): Set or Get the DI1 pin interrupt trigger mode (default 0,0)
8.2	96
8.7	97	(% style="color:#037691" %)AT+TRIG2 (%%): Set or Get the DI2 pin interrupt trigger mode (default 0,0)
8.2	98
8.7	99	(% style="color:#037691" %)AT+DI1TODO1 (%%): Set or get the mode in which DI1 maps to DO1 (default 0)
8.2	100
8.7	101	(% style="color:#037691" %)AT+DI1TORO1 (%%): Set or get the mode in which DI1 maps to RO1(default 0)
8.2	102
8.6	103	(% style="color:#037691" %)AT+DI2TODO2 (%%): Set or get the mode in which DI2 maps to DO2(default 0)
8.2	104
8.7	105	(% style="color:#037691" %)AT+DI2TORO2 (%%): Set or get the mode in which DI2 maps to RO2(default 0)
8.2	106
	107
	108
8.7	109	(% style="color:#4f81bd" %)Example 1:
8.2	110
8.7	111	AT+SEND=01020304 will send a payload of 01020304
8.2	112
	113
8.7	114	(% style="color:#4f81bd" %)Example 2:
8.2	115
8.8	116	AT+TRIGx=a Trigger directly without triggering time
8.2	117
8.7	118	AT+TRIGx=a,b
8.2	119
8.7	120	a=0: falling edge;
8.2	121
8.7	122	a=1: rising edge;
8.2	123
8.7	124	a=2: falling edge or rising edge;
8.2	125
8.7	126	b: triggering time in milliseconds.
8.2	127
8.7	128	AT+TRIGx=2,50 Falling edge or rising edge trigger, and the trigger time exceeds 50ms.
8.2	129
	130
8.7	131	(% style="color:#4f81bd" %)Example 3:
8.2	132
8.7	133	AT+DI1TODO1= maps value
8.2	134
8.7	135	AT+DI1TORO1= maps value
8.2	136
8.7	137	AT+DI2TODO2= maps value
8.2	138
8.7	139	AT+DI2TORO2= maps value
	140
	141
8.4	142	(% border="1" style="background-color:#f7faff; color:black; width:706px" %)
	143	\|=(% style="width: 102px;" %)Maps value\|=(% style="width: 331px;" %)DIx to DOx\|=(% style="width: 268px;" %)DIx to ROx
8.2	144	\|(% style="width:102px" %)0\|(% style="width:331px" %)No Action\|(% style="width:268px" %)No Action
	145	\|(% style="width:102px" %)1\|(% style="width:331px" %)If DIx is high, control DOx to output low level, If DIx is low, control DOx to output high level\|(% style="width:268px" %)(((
	146	If DIx is high, control ROx to close,
	147
	148	if DIx is low, control ROx to open
	149	)))
	150	\|(% style="width:102px" %)2\|(% style="width:331px" %)If DIx is high, control DOx to output high level, If DIx is low, control DOx to output low level\|(% style="width:268px" %)(((
	151	If DIx is high, control ROx to open,
	152
	153	if DIx is low, control ROx to close
	154	)))
	155	\|(% style="width:102px" %)3\|(% style="width:331px" %)DOx state flip\|(% style="width:268px" %)ROx state flip
	156
8.7	157	(% style="color:#4f81bd" %)Example 4:
8.2	158
8.7	159	AT+GROUPMOD=0 Set to point to point mode
8.2	160
8.7	161	AT+GROUPMOD=0,aa Set the TX group that controls the number of aa (The maximum value of aa is 8)
8.2	162
11.1	163	(((
8.7	164	AT+GROUPMOD=1,bb Set to the RX group controlled by the TX group, numbered bb(The maximum value of aa is 8)
11.1	165	)))
8.2	166
8.7	167	AT+GROUPMOD=0,2 Set to control the TX group of the two RX groups
8.2	168
8.7	169	AT+GROUPMOD=1,1 Set the RX group numbered 1
8.2	170
8.7	171	AT+GROUPMOD=1,2 Set the RX group numbered 2
8.2	172
	173
	174	== 2.4 Data Format ==
	175
	176	8 bytes of GROUPID + 9 bytes of payload + 4 bytes of checksum
	177
	178
8.8	179	(% style="color:#4f81bd" %)Payload:
8.2	180
8.4	181	(% border="1" style="background-color:#f7faff; color:black; width:938px" %)
	182	\|=(% style="width: 123px;" %)Size (bytes)\|=(% style="width: 107px;" %)1\|=(% style="width: 107px;" %)1\|=(% style="width: 107px;" %)1\|=(% style="width: 107px;" %)1\|=(% style="width: 107px;" %)1\|=(% style="width: 107px;" %)1\|=(% style="width: 107px;" %)1\|=(% style="width: 107px;" %)1\|=(% style="width: 107px;" %)1
	183	\|(% style="width:123px" %)Value\|(% style="width:38px" %)address\|(% style="width:70px" %)request\|(% style="width:52px" %)ACK\|(% style="width:127px" %)(((
8.2	184	DI1&
	185
	186	DI1 level
8.4	187	)))\|(% style="width:101px" %)DI1TODO1\|(% style="width:91px" %)DI1TORO1\|(% style="width:111px" %)(((
8.2	188	DI2&
	189
	190	DI2 level
8.4	191	)))\|(% style="width:105px" %)DI2TODO2\|(% style="width:106px" %)DI2TORO2
8.2	192
8.5	193	(% style="color:#037691" %)The first byte(%%): 00 is the broadcast address, 01-08 is the RX group number.
8.2	194
8.5	195	(% style="color:#037691" %)The second byte(%%): send mapping request when not 0, not request when it is 0.
8.2	196
8.5	197	(% style="color:#037691" %)The third byte(%%): ACK returned to the sender after the mapping is completed.
8.2	198
11.1	199	(((
8.5	200	(% style="color:#037691" %)The fourth byte(%%): the high four bits are 1 to represent DI1, and the low four bits are the level of DI1 when the interrupt is triggered.
11.1	201	)))
8.2	202
8.6	203	(% style="color:#037691" %)The Fifth byte(%%): DI1TODO1 when the interrupt is triggered, 0 when the interrupt is not triggered.
8.2	204
8.5	205	(% style="color:#037691" %)The Sixth byte(%%): 0 does not trigger interrupt when DI1TORO1 interrupt is triggered.
8.2	206
11.1	207	(((
8.5	208	(% style="color:#037691" %)The seventh byte(%%): the high four bits are 2 to represent DI2, and the low four bits are the level of DI2 when the interrupt is triggered.
11.1	209	)))
8.2	210
8.6	211	(% style="color:#037691" %)The 8th byte(%%): DI2TODO2 when the interrupt is triggered, 0 when the interrupt is not triggered.
8.2	212
8.5	213	(% style="color:#037691" %)The 9th byte(%%): DI2TORO2 when an interrupt is triggered, 0 when an interrupt is not triggered.
8.2	214
1.1	215

Wiki source code of Point to Point Communication of LT-22222-L

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