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

Version 15.3 by Xiaoling on 2022/06/02 14:52

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
12.2	22	=== 2.1.1 Overview ===
8.1	23
8.2	24	[[image:image-20220602111219-1.png\|\|height="472" width="972"]]
4.2	25
	26
12.2	27	=== 2.2.2 Configure ===
4.2	28
15.3	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
	42
7.1	43
15.2	44	=== 2.2.3 Serial port display ===
12.2	45
15.2	46
12.2	47	(% class="wikigeneratedid" %)
4.2	48	[[image:image-20220602111219-2.png]]
	49
	50
12.2	51	(% class="wikigeneratedid" %)
4.2	52	[[image:image-20220602111219-3.png]]
	53
12.2	54	(% class="wikigeneratedid" %)
	55	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.
	56
	57
	58	== 2.2 Point To Mult-Point ==
	59
15.2	60	=== 2.2.1 Overview ===
12.2	61
	62
15.2	63	[[image:1654152390874-192.png]]
12.2	64
	65
15.2	66	=== 2.2.2 Configure ===
	67
	68
	69	(% style="color:#4f81bd" %)Configuration of the TX group:
	70
	71	AT+GROUPMOD=0,2
	72
	73	AT+TXCHS=868700000
	74
	75	AT+RXCHS=869000000
	76
	77	AT+TRIG1=2,50
	78
	79	AT+TRIG2=2,50
	80
	81	AT+DI1TODO1=1
	82
	83	AT+DI1TORO1=1
	84
	85	AT+DI2TODO2=1
	86
	87	AT+DI2TORO2=1
	88
	89
	90	(% style="color:#4f81bd" %)Configuration for RX group number 1:
	91
	92	AT+GROUPMOD=1,1
	93
	94	AT+TXCHS=869000000
	95
	96	AT+RXCHS=868700000
	97
	98
	99	(% style="color:#4f81bd" %)Configuration for RX group number 2:
	100
	101	AT+GROUPMOD=1,2
	102
	103	AT+TXCHS=869000000
	104
	105	AT+RXCHS=868700000
	106
	107
	108	=== 2.2.3 Serial port display ===
	109
	110
	111	[[image:image-20220602144747-1.png]]
	112
	113
	114	[[image:image-20220602144747-2.png]]
	115
8.9	116	(((
15.2	117	If the TX group does not receive all the ACK replies from the RX group, it will retransmit up to 4 times, each time interval is 30 seconds, and the retransmission UplinkCounter will not increase.
8.9	118	)))
4.2	119
8.2	120
15.2	121
	122
8.2	123	== 2.3 AT command ==
	124
	125
11.3	126	(((
8.6	127	(% style="color:#037691" %)ATZ (%%): Trig a reset of the MCU
11.3	128	)))
8.2	129
11.3	130	(((
8.6	131	(% style="color:#037691" %)AT+FDR (%%): Reset Parameters to Factory Default, Keys Reserve
11.3	132	)))
8.2	133
11.3	134	(((
8.6	135	(% style="color:#037691" %)AT+FCU (%%): Get or Set the Frame Counter Uplink
11.3	136	)))
8.2	137
11.3	138	(((
8.6	139	(% style="color:#037691" %)AT+FCD (%%): Get or Set the Frame Counter Downlink
11.3	140	)))
8.2	141
11.3	142	(((
8.6	143	(% style="color:#037691" %)AT+TXP (%%): Get or Set the transmit power, the maximum is 20dBm (default is 14dBm)
11.3	144	)))
8.2	145
11.3	146	(((
8.8	147	(% style="color:#037691" %)AT+SYNC (%%): Get or Set the Sync word [1:0x34,0:0x12] (default is 1)
11.3	148	)))
8.2	149
11.3	150	(((
8.7	151	(% style="color:#037691" %)AT+PMB (%%): Get or Set the preamble (default:8)
11.3	152	)))
8.2	153
11.3	154	(((
8.6	155	(% style="color:#037691" %)AT+TXCHS (%%): Get or Set the transmit frequency of TX (default:868700000)
11.3	156	)))
8.2	157
11.3	158	(((
8.6	159	(% style="color:#037691" %)AT+TXSF (%%): Get or Set the spreading factor of TX (7 to 12) (default:12)
11.3	160	)))
8.2	161
11.3	162	(((
8.6	163	(% style="color:#037691" %)AT+RXCHS (%%): Get or Set the transmit frequency of RX (default:869000000)
11.3	164	)))
8.2	165
11.3	166	(((
8.6	167	(% style="color:#037691" %)AT+RXSF (%%): Get or Set the spreading factor of RX (7 to 12) (default:12)
11.3	168	)))
8.2	169
11.3	170	(((
9.2	171	(% style="color:#037691" %)AT+BW (%%): Get or Set the bandwidth [0:125khz,1:250khz,2:500khz] (default:0)
11.3	172	)))
8.2	173
11.3	174	(((
8.7	175	(% 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)
11.3	176	)))
8.2	177
11.3	178	(((
8.6	179	(% style="color:#037691" %)AT+TDC (%%): Get or set the application data transmission interval in ms(default 10 minutes)
11.3	180	)))
8.2	181
11.3	182	(((
8.8	183	(% style="color:#037691" %)AT+VER (%%): Get firmware version number
11.3	184	)))
8.2	185
11.3	186	(((
9.2	187	(% style="color:#037691" %)AT+SEND (%%): Set Custom sent hex data
11.3	188	)))
8.2	189
11.3	190	(((
8.6	191	(% style="color:#037691" %)AT+GROUPMOD (%%): Set or Get the grouping mode of the device (default: 0)
11.3	192	)))
8.2	193
11.1	194	(((
11.3	195	(((
8.7	196	(% 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	197	)))
11.3	198	)))
8.2	199
11.3	200	(((
8.6	201	(% style="color:#037691" %)AT+TRIG1 (%%): Set or Get the DI1 pin interrupt trigger mode (default 0,0)
11.3	202	)))
8.2	203
11.3	204	(((
8.7	205	(% style="color:#037691" %)AT+TRIG2 (%%): Set or Get the DI2 pin interrupt trigger mode (default 0,0)
11.3	206	)))
8.2	207
11.3	208	(((
8.7	209	(% style="color:#037691" %)AT+DI1TODO1 (%%): Set or get the mode in which DI1 maps to DO1 (default 0)
11.3	210	)))
8.2	211
11.3	212	(((
8.7	213	(% style="color:#037691" %)AT+DI1TORO1 (%%): Set or get the mode in which DI1 maps to RO1(default 0)
11.3	214	)))
8.2	215
11.3	216	(((
8.6	217	(% style="color:#037691" %)AT+DI2TODO2 (%%): Set or get the mode in which DI2 maps to DO2(default 0)
11.3	218	)))
8.2	219
11.3	220	(((
8.7	221	(% style="color:#037691" %)AT+DI2TORO2 (%%): Set or get the mode in which DI2 maps to RO2(default 0)
11.3	222	)))
8.2	223
11.3	224	(((
	225
	226	)))
8.2	227
11.3	228	(((
	229
	230	)))
8.2	231
11.3	232	(((
8.7	233	(% style="color:#4f81bd" %)Example 1:
11.3	234	)))
8.2	235
11.3	236	(((
8.7	237	AT+SEND=01020304 will send a payload of 01020304
11.3	238	)))
8.2	239
11.3	240	(((
	241
	242	)))
8.2	243
11.3	244	(((
8.7	245	(% style="color:#4f81bd" %)Example 2:
11.3	246	)))
8.2	247
11.3	248	(((
8.8	249	AT+TRIGx=a Trigger directly without triggering time
11.3	250	)))
8.2	251
11.3	252	(((
8.7	253	AT+TRIGx=a,b
11.3	254	)))
8.2	255
11.3	256	(((
8.7	257	a=0: falling edge;
11.3	258	)))
8.2	259
11.3	260	(((
8.7	261	a=1: rising edge;
11.3	262	)))
8.2	263
11.3	264	(((
8.7	265	a=2: falling edge or rising edge;
11.3	266	)))
8.2	267
11.3	268	(((
8.7	269	b: triggering time in milliseconds.
11.3	270	)))
8.2	271
11.3	272	(((
8.7	273	AT+TRIGx=2,50 Falling edge or rising edge trigger, and the trigger time exceeds 50ms.
11.3	274	)))
8.2	275
11.3	276	(((
	277
	278	)))
8.2	279
11.3	280	(((
8.7	281	(% style="color:#4f81bd" %)Example 3:
11.3	282	)))
8.2	283
11.3	284	(((
8.7	285	AT+DI1TODO1= maps value
11.3	286	)))
8.2	287
11.3	288	(((
8.7	289	AT+DI1TORO1= maps value
11.3	290	)))
8.2	291
11.3	292	(((
8.7	293	AT+DI2TODO2= maps value
11.3	294	)))
8.2	295
11.3	296	(((
8.7	297	AT+DI2TORO2= maps value
11.3	298	)))
8.7	299
11.3	300	(((
	301
	302	)))
8.7	303
8.4	304	(% border="1" style="background-color:#f7faff; color:black; width:706px" %)
11.3	305	\|=(% style="width: 102px;" %)(((
	306	Maps value
	307	)))\|=(% style="width: 331px;" %)(((
	308	DIx to DOx
	309	)))\|=(% style="width: 268px;" %)(((
	310	DIx to ROx
	311	)))
	312	\|(% style="width:102px" %)(((
	313	0
	314	)))\|(% style="width:331px" %)(((
	315	No Action
	316	)))\|(% style="width:268px" %)(((
	317	No Action
	318	)))
	319	\|(% style="width:102px" %)(((
	320	1
	321	)))\|(% style="width:331px" %)(((
	322	If DIx is high, control DOx to output low level, If DIx is low, control DOx to output high level
	323	)))\|(% style="width:268px" %)(((
	324	(((
8.2	325	If DIx is high, control ROx to close,
11.3	326	)))
8.2	327
11.3	328	(((
8.2	329	if DIx is low, control ROx to open
	330	)))
11.3	331	)))
	332	\|(% style="width:102px" %)(((
	333	2
	334	)))\|(% style="width:331px" %)(((
	335	If DIx is high, control DOx to output high level, If DIx is low, control DOx to output low level
	336	)))\|(% style="width:268px" %)(((
	337	(((
8.2	338	If DIx is high, control ROx to open,
11.3	339	)))
8.2	340
11.3	341	(((
8.2	342	if DIx is low, control ROx to close
	343	)))
11.3	344	)))
	345	\|(% style="width:102px" %)(((
	346	3
	347	)))\|(% style="width:331px" %)(((
	348	DOx state flip
	349	)))\|(% style="width:268px" %)(((
	350	ROx state flip
	351	)))
8.2	352
11.3	353	(((
8.7	354	(% style="color:#4f81bd" %)Example 4:
11.3	355	)))
8.2	356
11.3	357	(((
8.7	358	AT+GROUPMOD=0 Set to point to point mode
11.3	359	)))
8.2	360
11.3	361	(((
8.7	362	AT+GROUPMOD=0,aa Set the TX group that controls the number of aa (The maximum value of aa is 8)
11.3	363	)))
8.2	364
11.1	365	(((
11.3	366	(((
8.7	367	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	368	)))
11.3	369	)))
8.2	370
11.3	371	(((
8.7	372	AT+GROUPMOD=0,2 Set to control the TX group of the two RX groups
11.3	373	)))
8.2	374
11.3	375	(((
8.7	376	AT+GROUPMOD=1,1 Set the RX group numbered 1
11.3	377	)))
8.2	378
11.3	379	(((
8.7	380	AT+GROUPMOD=1,2 Set the RX group numbered 2
11.3	381	)))
8.2	382
	383
	384	== 2.4 Data Format ==
	385
11.3	386	(((
8.2	387	8 bytes of GROUPID + 9 bytes of payload + 4 bytes of checksum
11.3	388	)))
8.2	389
11.3	390	(((
	391
	392	)))
8.2	393
11.3	394	(((
8.8	395	(% style="color:#4f81bd" %)Payload:
11.3	396	)))
8.2	397
8.4	398	(% border="1" style="background-color:#f7faff; color:black; width:938px" %)
11.3	399	\|=(% style="width: 123px;" %)(((
	400	Size (bytes)
	401	)))\|=(% style="width: 107px;" %)(((
	402	1
	403	)))\|=(% style="width: 107px;" %)(((
	404	1
	405	)))\|=(% style="width: 107px;" %)(((
	406	1
	407	)))\|=(% style="width: 107px;" %)(((
	408	1
	409	)))\|=(% style="width: 107px;" %)(((
	410	1
	411	)))\|=(% style="width: 107px;" %)(((
	412	1
	413	)))\|=(% style="width: 107px;" %)(((
	414	1
	415	)))\|=(% style="width: 107px;" %)(((
	416	1
	417	)))\|=(% style="width: 107px;" %)(((
	418	1
	419	)))
	420	\|(% style="width:123px" %)(((
	421	Value
	422	)))\|(% style="width:38px" %)(((
	423	address
	424	)))\|(% style="width:70px" %)(((
	425	request
	426	)))\|(% style="width:52px" %)(((
	427	ACK
	428	)))\|(% style="width:127px" %)(((
	429	(((
8.2	430	DI1&
11.3	431	)))
8.2	432
11.3	433	(((
8.2	434	DI1 level
11.3	435	)))
	436	)))\|(% style="width:101px" %)(((
	437	DI1TODO1
	438	)))\|(% style="width:91px" %)(((
	439	DI1TORO1
	440	)))\|(% style="width:111px" %)(((
	441	(((
8.2	442	DI2&
11.3	443	)))
8.2	444
11.3	445	(((
8.2	446	DI2 level
11.3	447	)))
	448	)))\|(% style="width:105px" %)(((
	449	DI2TODO2
	450	)))\|(% style="width:106px" %)(((
	451	DI2TORO2
	452	)))
8.2	453
11.3	454	(((
8.5	455	(% style="color:#037691" %)The first byte(%%): 00 is the broadcast address, 01-08 is the RX group number.
11.3	456	)))
8.2	457
11.3	458	(((
8.5	459	(% style="color:#037691" %)The second byte(%%): send mapping request when not 0, not request when it is 0.
11.3	460	)))
8.2	461
11.3	462	(((
8.5	463	(% style="color:#037691" %)The third byte(%%): ACK returned to the sender after the mapping is completed.
11.3	464	)))
8.2	465
11.1	466	(((
11.3	467	(((
8.5	468	(% 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	469	)))
11.3	470	)))
8.2	471
11.3	472	(((
8.6	473	(% style="color:#037691" %)The Fifth byte(%%): DI1TODO1 when the interrupt is triggered, 0 when the interrupt is not triggered.
11.3	474	)))
8.2	475
11.3	476	(((
8.5	477	(% style="color:#037691" %)The Sixth byte(%%): 0 does not trigger interrupt when DI1TORO1 interrupt is triggered.
11.3	478	)))
8.2	479
11.1	480	(((
11.3	481	(((
8.5	482	(% 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	483	)))
11.3	484	)))
8.2	485
11.3	486	(((
8.6	487	(% style="color:#037691" %)The 8th byte(%%): DI2TODO2 when the interrupt is triggered, 0 when the interrupt is not triggered.
11.3	488	)))
8.2	489
11.3	490	(((
8.5	491	(% style="color:#037691" %)The 9th byte(%%): DI2TORO2 when an interrupt is triggered, 0 when an interrupt is not triggered.
11.3	492	)))
8.2	493
1.1	494

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