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

Version 18.1 by Edwin Chen on 2022/06/02 15:24

version	line-number	content
16.2	1	Contents：
	2
1.1	3	{{toc/}}
	4
16.2	5
	6
	7
4.2	8	= 1. Overview =
1.1	9
6.1	10	(((
1.1	11	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	12	)))
1.1	13
6.1	14	(((
1.1	15	[[Point to Point Software for LT-22222-L>>https://github.com/dragino/LT-22222-L]].
6.1	16	)))
1.1	17
	18
4.2	19	= 2. Features for this firmware =
1.1	20
8.2	21	== 2.1 Point To Point ==
4.2	22
12.2	23	=== 2.1.1 Overview ===
8.1	24
15.4	25
8.2	26	[[image:image-20220602111219-1.png\|\|height="472" width="972"]]
4.2	27
	28
12.2	29	=== 2.2.2 Configure ===
4.2	30
15.3	31
4.3	32	(% border="1" style="background-color:#f7faff; color:black; width:500px" %)
	33	\|=A's configuration\|=B's configuration
	34	\|AT+GROUPMOD=0\|AT+GROUPMOD=0
	35	\|AT+TXCHS=868700000\|AT+TXCHS=869000000
	36	\|AT+RXCHS=869000000\|AT+RXCHS=868700000
	37	\|AT+TRIG1=2,50\|AT+TRIG1=2,50
	38	\|AT+TRIG2=2,50\|AT+TRIG2=2,50
	39	\|AT+DI1TODO1=2\|AT+DI1TODO1=2
	40	\|AT+DI1TORO1=2\|AT+DI1TORO1=2
	41	\|AT+DI2TODO2=2 \|AT+DI2TODO2=2
	42	\|AT+DI2TORO2=2\|AT+DI2TORO2=2
4.2	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
	121	== 2.3 AT command ==
	122
	123
11.3	124	(((
8.6	125	(% style="color:#037691" %)ATZ (%%): Trig a reset of the MCU
11.3	126	)))
8.2	127
11.3	128	(((
8.6	129	(% style="color:#037691" %)AT+FDR (%%): Reset Parameters to Factory Default, Keys Reserve
11.3	130	)))
8.2	131
11.3	132	(((
8.6	133	(% style="color:#037691" %)AT+FCU (%%): Get or Set the Frame Counter Uplink
11.3	134	)))
8.2	135
11.3	136	(((
8.6	137	(% style="color:#037691" %)AT+FCD (%%): Get or Set the Frame Counter Downlink
11.3	138	)))
8.2	139
11.3	140	(((
8.6	141	(% style="color:#037691" %)AT+TXP (%%): Get or Set the transmit power, the maximum is 20dBm (default is 14dBm)
11.3	142	)))
8.2	143
11.3	144	(((
8.8	145	(% style="color:#037691" %)AT+SYNC (%%): Get or Set the Sync word [1:0x34,0:0x12] (default is 1)
11.3	146	)))
8.2	147
11.3	148	(((
8.7	149	(% style="color:#037691" %)AT+PMB (%%): Get or Set the preamble (default:8)
11.3	150	)))
8.2	151
11.3	152	(((
8.6	153	(% style="color:#037691" %)AT+TXCHS (%%): Get or Set the transmit frequency of TX (default:868700000)
11.3	154	)))
8.2	155
11.3	156	(((
8.6	157	(% style="color:#037691" %)AT+TXSF (%%): Get or Set the spreading factor of TX (7 to 12) (default:12)
11.3	158	)))
8.2	159
11.3	160	(((
8.6	161	(% style="color:#037691" %)AT+RXCHS (%%): Get or Set the transmit frequency of RX (default:869000000)
11.3	162	)))
8.2	163
11.3	164	(((
8.6	165	(% style="color:#037691" %)AT+RXSF (%%): Get or Set the spreading factor of RX (7 to 12) (default:12)
11.3	166	)))
8.2	167
11.3	168	(((
9.2	169	(% style="color:#037691" %)AT+BW (%%): Get or Set the bandwidth [0:125khz,1:250khz,2:500khz] (default:0)
11.3	170	)))
8.2	171
11.3	172	(((
8.7	173	(% 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	174	)))
8.2	175
11.3	176	(((
8.6	177	(% style="color:#037691" %)AT+TDC (%%): Get or set the application data transmission interval in ms(default 10 minutes)
11.3	178	)))
8.2	179
11.3	180	(((
8.8	181	(% style="color:#037691" %)AT+VER (%%): Get firmware version number
11.3	182	)))
8.2	183
11.3	184	(((
9.2	185	(% style="color:#037691" %)AT+SEND (%%): Set Custom sent hex data
11.3	186	)))
8.2	187
11.3	188	(((
8.6	189	(% style="color:#037691" %)AT+GROUPMOD (%%): Set or Get the grouping mode of the device (default: 0)
11.3	190	)))
8.2	191
11.1	192	(((
11.3	193	(((
8.7	194	(% 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	195	)))
11.3	196	)))
8.2	197
11.3	198	(((
8.6	199	(% style="color:#037691" %)AT+TRIG1 (%%): Set or Get the DI1 pin interrupt trigger mode (default 0,0)
11.3	200	)))
8.2	201
11.3	202	(((
8.7	203	(% style="color:#037691" %)AT+TRIG2 (%%): Set or Get the DI2 pin interrupt trigger mode (default 0,0)
11.3	204	)))
8.2	205
11.3	206	(((
8.7	207	(% style="color:#037691" %)AT+DI1TODO1 (%%): Set or get the mode in which DI1 maps to DO1 (default 0)
11.3	208	)))
8.2	209
11.3	210	(((
8.7	211	(% style="color:#037691" %)AT+DI1TORO1 (%%): Set or get the mode in which DI1 maps to RO1(default 0)
11.3	212	)))
8.2	213
11.3	214	(((
8.6	215	(% style="color:#037691" %)AT+DI2TODO2 (%%): Set or get the mode in which DI2 maps to DO2(default 0)
11.3	216	)))
8.2	217
11.3	218	(((
8.7	219	(% style="color:#037691" %)AT+DI2TORO2 (%%): Set or get the mode in which DI2 maps to RO2(default 0)
11.3	220	)))
8.2	221
11.3	222	(((
	223
	224	)))
8.2	225
11.3	226	(((
	227
	228	)))
8.2	229
11.3	230	(((
8.7	231	(% style="color:#4f81bd" %)Example 1:
11.3	232	)))
8.2	233
11.3	234	(((
8.7	235	AT+SEND=01020304 will send a payload of 01020304
11.3	236	)))
8.2	237
11.3	238	(((
	239
	240	)))
8.2	241
11.3	242	(((
8.7	243	(% style="color:#4f81bd" %)Example 2:
11.3	244	)))
8.2	245
11.3	246	(((
8.8	247	AT+TRIGx=a Trigger directly without triggering time
11.3	248	)))
8.2	249
11.3	250	(((
8.7	251	AT+TRIGx=a,b
11.3	252	)))
8.2	253
11.3	254	(((
8.7	255	a=0: falling edge;
11.3	256	)))
8.2	257
11.3	258	(((
8.7	259	a=1: rising edge;
11.3	260	)))
8.2	261
11.3	262	(((
8.7	263	a=2: falling edge or rising edge;
11.3	264	)))
8.2	265
11.3	266	(((
8.7	267	b: triggering time in milliseconds.
11.3	268	)))
8.2	269
11.3	270	(((
8.7	271	AT+TRIGx=2,50 Falling edge or rising edge trigger, and the trigger time exceeds 50ms.
11.3	272	)))
8.2	273
11.3	274	(((
	275
	276	)))
8.2	277
11.3	278	(((
8.7	279	(% style="color:#4f81bd" %)Example 3:
11.3	280	)))
8.2	281
11.3	282	(((
8.7	283	AT+DI1TODO1= maps value
11.3	284	)))
8.2	285
11.3	286	(((
8.7	287	AT+DI1TORO1= maps value
11.3	288	)))
8.2	289
11.3	290	(((
8.7	291	AT+DI2TODO2= maps value
11.3	292	)))
8.2	293
11.3	294	(((
8.7	295	AT+DI2TORO2= maps value
11.3	296	)))
8.7	297
11.3	298	(((
	299
	300	)))
8.7	301
8.4	302	(% border="1" style="background-color:#f7faff; color:black; width:706px" %)
11.3	303	\|=(% style="width: 102px;" %)(((
	304	Maps value
	305	)))\|=(% style="width: 331px;" %)(((
	306	DIx to DOx
	307	)))\|=(% style="width: 268px;" %)(((
	308	DIx to ROx
	309	)))
	310	\|(% style="width:102px" %)(((
	311	0
	312	)))\|(% style="width:331px" %)(((
	313	No Action
	314	)))\|(% style="width:268px" %)(((
	315	No Action
	316	)))
	317	\|(% style="width:102px" %)(((
	318	1
	319	)))\|(% style="width:331px" %)(((
	320	If DIx is high, control DOx to output low level, If DIx is low, control DOx to output high level
	321	)))\|(% style="width:268px" %)(((
	322	(((
8.2	323	If DIx is high, control ROx to close,
11.3	324	)))
8.2	325
11.3	326	(((
8.2	327	if DIx is low, control ROx to open
	328	)))
11.3	329	)))
	330	\|(% style="width:102px" %)(((
	331	2
	332	)))\|(% style="width:331px" %)(((
	333	If DIx is high, control DOx to output high level, If DIx is low, control DOx to output low level
	334	)))\|(% style="width:268px" %)(((
	335	(((
8.2	336	If DIx is high, control ROx to open,
11.3	337	)))
8.2	338
11.3	339	(((
8.2	340	if DIx is low, control ROx to close
	341	)))
11.3	342	)))
	343	\|(% style="width:102px" %)(((
	344	3
	345	)))\|(% style="width:331px" %)(((
	346	DOx state flip
	347	)))\|(% style="width:268px" %)(((
	348	ROx state flip
	349	)))
8.2	350
11.3	351	(((
8.7	352	(% style="color:#4f81bd" %)Example 4:
11.3	353	)))
8.2	354
11.3	355	(((
8.7	356	AT+GROUPMOD=0 Set to point to point mode
11.3	357	)))
8.2	358
11.3	359	(((
8.7	360	AT+GROUPMOD=0,aa Set the TX group that controls the number of aa (The maximum value of aa is 8)
11.3	361	)))
8.2	362
11.1	363	(((
11.3	364	(((
8.7	365	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	366	)))
11.3	367	)))
8.2	368
11.3	369	(((
8.7	370	AT+GROUPMOD=0,2 Set to control the TX group of the two RX groups
11.3	371	)))
8.2	372
11.3	373	(((
8.7	374	AT+GROUPMOD=1,1 Set the RX group numbered 1
11.3	375	)))
8.2	376
11.3	377	(((
8.7	378	AT+GROUPMOD=1,2 Set the RX group numbered 2
11.3	379	)))
8.2	380
	381
	382	== 2.4 Data Format ==
	383
11.3	384	(((
8.2	385	8 bytes of GROUPID + 9 bytes of payload + 4 bytes of checksum
11.3	386	)))
8.2	387
11.3	388	(((
	389
	390	)))
8.2	391
11.3	392	(((
8.8	393	(% style="color:#4f81bd" %)Payload:
11.3	394	)))
8.2	395
8.4	396	(% border="1" style="background-color:#f7faff; color:black; width:938px" %)
11.3	397	\|=(% style="width: 123px;" %)(((
	398	Size (bytes)
	399	)))\|=(% style="width: 107px;" %)(((
	400	1
	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	)))
	418	\|(% style="width:123px" %)(((
	419	Value
	420	)))\|(% style="width:38px" %)(((
	421	address
	422	)))\|(% style="width:70px" %)(((
	423	request
	424	)))\|(% style="width:52px" %)(((
	425	ACK
	426	)))\|(% style="width:127px" %)(((
	427	(((
8.2	428	DI1&
11.3	429	)))
8.2	430
11.3	431	(((
8.2	432	DI1 level
11.3	433	)))
	434	)))\|(% style="width:101px" %)(((
	435	DI1TODO1
	436	)))\|(% style="width:91px" %)(((
	437	DI1TORO1
	438	)))\|(% style="width:111px" %)(((
	439	(((
8.2	440	DI2&
11.3	441	)))
8.2	442
11.3	443	(((
8.2	444	DI2 level
11.3	445	)))
	446	)))\|(% style="width:105px" %)(((
	447	DI2TODO2
	448	)))\|(% style="width:106px" %)(((
	449	DI2TORO2
	450	)))
8.2	451
11.3	452	(((
8.5	453	(% style="color:#037691" %)The first byte(%%): 00 is the broadcast address, 01-08 is the RX group number.
11.3	454	)))
8.2	455
11.3	456	(((
8.5	457	(% style="color:#037691" %)The second byte(%%): send mapping request when not 0, not request when it is 0.
11.3	458	)))
8.2	459
11.3	460	(((
8.5	461	(% style="color:#037691" %)The third byte(%%): ACK returned to the sender after the mapping is completed.
11.3	462	)))
8.2	463
11.1	464	(((
11.3	465	(((
8.5	466	(% 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	467	)))
11.3	468	)))
8.2	469
11.3	470	(((
8.6	471	(% style="color:#037691" %)The Fifth byte(%%): DI1TODO1 when the interrupt is triggered, 0 when the interrupt is not triggered.
11.3	472	)))
8.2	473
11.3	474	(((
8.5	475	(% style="color:#037691" %)The Sixth byte(%%): 0 does not trigger interrupt when DI1TORO1 interrupt is triggered.
11.3	476	)))
8.2	477
11.1	478	(((
11.3	479	(((
8.5	480	(% 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	481	)))
11.3	482	)))
8.2	483
11.3	484	(((
8.6	485	(% style="color:#037691" %)The 8th byte(%%): DI2TODO2 when the interrupt is triggered, 0 when the interrupt is not triggered.
11.3	486	)))
8.2	487
11.3	488	(((
8.5	489	(% style="color:#037691" %)The 9th byte(%%): DI2TORO2 when an interrupt is triggered, 0 when an interrupt is not triggered.
11.3	490	)))
8.2	491
1.1	492

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