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

Version 8.5 by Xiaoling on 2022/06/02 13:51

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
8.1	29
4.3	30	(% border="1" style="background-color:#f7faff; color:black; width:500px" %)
	31	\|=A's configuration\|=B's configuration
	32	\|AT+GROUPMOD=0\|AT+GROUPMOD=0
	33	\|AT+TXCHS=868700000\|AT+TXCHS=869000000
	34	\|AT+RXCHS=869000000\|AT+RXCHS=868700000
	35	\|AT+TRIG1=2,50\|AT+TRIG1=2,50
	36	\|AT+TRIG2=2,50\|AT+TRIG2=2,50
	37	\|AT+DI1TODO1=2\|AT+DI1TODO1=2
	38	\|AT+DI1TORO1=2\|AT+DI1TORO1=2
	39	\|AT+DI2TODO2=2 \|AT+DI2TODO2=2
	40	\|AT+DI2TORO2=2\|AT+DI2TORO2=2
4.2	41
8.2	42	== 2.2 Point To Mult-Point ==
4.2	43
7.1	44
4.2	45	[[image:image-20220602111219-2.png]]
	46
	47
	48	[[image:image-20220602111219-3.png]]
	49
	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.
	51
8.2	52
	53	== 2.3 AT command ==
	54
	55
	56	ATZ : Trig a reset of the MCU
	57
	58	AT+FDR : Reset Parameters to Factory Default, Keys Reserve
	59
	60	AT+FCU : Get or Set the Frame Counter Uplink
	61
	62	AT+FCD : Get or Set the Frame Counter Downlink
	63
	64	AT+TXP : Get or Set the transmit power, the maximum is 20dBm (default is 14dBm)
	65
	66	AT+SYNC : Get or Set the Sync word [1:0x34,0:0x12] (default is 1)
	67
	68	AT+PMB : Get or Set the preamble (default:8)
	69
	70	AT+TXCHS : Get or Set the transmit frequency of TX (default:868700000)
	71
	72	AT+TXSF : Get or Set the spreading factor of TX (7 to 12) (default:12)
	73
	74	AT+RXCHS : Get or Set the transmit frequency of RX (default:869000000)
	75
	76	AT+RXSF : Get or Set the spreading factor of RX (7 to 12) (default:12)
	77
	78	AT+BW : Get or Set the bandwidth [0:125khz,1:250khz,2:500khz] (default:0)
	79
	80	AT+CR : Get or Set the coding rate [1: 4/5, 2: 4/6, 3: 4/7, 4: 4/8] (default:1)
	81
	82	AT+TDC : Get or set the application data transmission interval in ms(default 10 minutes)
	83
	84	AT+VER : Get firmware version number
	85
	86	AT+SEND : Set Custom sent hex data
	87
	88	AT+GROUPMOD : Set or Get the grouping mode of the device (default: 0)
	89
	90	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)
	91
	92	AT+TRIG1 : Set or Get the DI1 pin interrupt trigger mode (default 0,0)
	93
	94	AT+TRIG2 : Set or Get the DI2 pin interrupt trigger mode (default 0,0)
	95
	96	AT+DI1TODO1 : Set or get the mode in which DI1 maps to DO1 (default 0)
	97
	98	AT+DI1TORO1 : Set or get the mode in which DI1 maps to RO1(default 0)
	99
	100	AT+DI2TODO2 : Set or get the mode in which DI2 maps to DO2(default 0)
	101
	102	AT+DI2TORO2 : Set or get the mode in which DI2 maps to RO2(default 0)
	103
	104
	105
8.3	106	Example1: AT+SEND=01020304 will send a payload of 01020304
8.2	107
	108
	109	i.g. AT+TRIGx=a Trigger directly without triggering time
	110
	111	AT+TRIGx=a,b a=0, falling edge;
	112
	113	a=1, rising edge;
	114
	115	a=2, falling edge or rising edge.
	116
	117	b, triggering time in milliseconds
	118
	119	AT+TRIGx=2,50 Falling edge or rising edge trigger, and the trigger time exceeds 50ms
	120
	121
	122	i.g. AT+DI1TODO1= maps value
	123
	124	AT+DI1TORO1= maps value
	125
	126	AT+DI2TODO2= maps value
	127
	128	AT+DI2TORO2= maps value
	129
	130
	131
	132
8.4	133	(% border="1" style="background-color:#f7faff; color:black; width:706px" %)
	134	\|=(% style="width: 102px;" %)Maps value\|=(% style="width: 331px;" %)DIx to DOx\|=(% style="width: 268px;" %)DIx to ROx
8.2	135	\|(% style="width:102px" %)0\|(% style="width:331px" %)No Action\|(% style="width:268px" %)No Action
	136	\|(% 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" %)(((
	137	If DIx is high, control ROx to close,
	138
	139	if DIx is low, control ROx to open
	140	)))
	141	\|(% 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" %)(((
	142	If DIx is high, control ROx to open,
	143
	144	if DIx is low, control ROx to close
	145	)))
	146	\|(% style="width:102px" %)3\|(% style="width:331px" %)DOx state flip\|(% style="width:268px" %)ROx state flip
	147
	148	i.g. AT+GROUPMOD=0 Set to point to point mode
	149
	150	AT+GROUPMOD=0,aa Set the TX group that controls the number of aa (The maximum value of aa is 8)
	151
	152	AT+GROUPMOD=1,bb Set to the RX group controlled by the TX group, numbered bb(The maximum value of aa is 8)
	153
	154
	155	AT+GROUPMOD=0,2 Set to control the TX group of the two RX groups
	156
	157	AT+GROUPMOD=1,1 Set the RX group numbered 1
	158
	159	AT+GROUPMOD=1,2 Set the RX group numbered 2
	160
	161
	162
	163	== 2.4 Data Format ==
	164
	165	8 bytes of GROUPID + 9 bytes of payload + 4 bytes of checksum
	166
	167
8.5	168	Payload:
8.2	169
8.4	170	(% border="1" style="background-color:#f7faff; color:black; width:938px" %)
	171	\|=(% 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
	172	\|(% style="width:123px" %)Value\|(% style="width:38px" %)address\|(% style="width:70px" %)request\|(% style="width:52px" %)ACK\|(% style="width:127px" %)(((
8.2	173	DI1&
	174
	175	DI1 level
8.4	176	)))\|(% style="width:101px" %)DI1TODO1\|(% style="width:91px" %)DI1TORO1\|(% style="width:111px" %)(((
8.2	177	DI2&
	178
	179	DI2 level
8.4	180	)))\|(% style="width:105px" %)DI2TODO2\|(% style="width:106px" %)DI2TORO2
8.2	181
8.5	182	(% style="color:#037691" %)The first byte(%%): 00 is the broadcast address, 01-08 is the RX group number.
8.2	183
8.5	184	(% style="color:#037691" %)The second byte(%%): send mapping request when not 0, not request when it is 0.
8.2	185
8.5	186	(% style="color:#037691" %)The third byte(%%): ACK returned to the sender after the mapping is completed.
8.2	187
8.5	188	(% 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.
8.2	189
8.5	190	(% style="color:#037691" %)The Fifth byte(%%): DI1TODO1 when the interrupt is triggered, 0 when the interrupt is not triggered.
8.2	191
8.5	192	(% style="color:#037691" %)The Sixth byte(%%): 0 does not trigger interrupt when DI1TORO1 interrupt is triggered.
8.2	193
8.5	194	(% 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.
8.2	195
8.5	196	(% style="color:#037691" %)The 8th byte(%%): DI2TODO2 when the interrupt is triggered, 0 when the interrupt is not triggered.
8.2	197
8.5	198	(% style="color:#037691" %)The 9th byte(%%): DI2TORO2 when an interrupt is triggered, 0 when an interrupt is not triggered.
8.2	199
1.1	200

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

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