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

Version 15.5 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
15.4	24
8.2	25	[[image:image-20220602111219-1.png\|\|height="472" width="972"]]
4.2	26
	27
12.2	28	=== 2.2.2 Configure ===
4.2	29
15.3	30
4.3	31	(% border="1" style="background-color:#f7faff; color:black; width:500px" %)
	32	\|=A's configuration\|=B's configuration
	33	\|AT+GROUPMOD=0\|AT+GROUPMOD=0
	34	\|AT+TXCHS=868700000\|AT+TXCHS=869000000
	35	\|AT+RXCHS=869000000\|AT+RXCHS=868700000
	36	\|AT+TRIG1=2,50\|AT+TRIG1=2,50
	37	\|AT+TRIG2=2,50\|AT+TRIG2=2,50
	38	\|AT+DI1TODO1=2\|AT+DI1TODO1=2
	39	\|AT+DI1TORO1=2\|AT+DI1TORO1=2
	40	\|AT+DI2TODO2=2 \|AT+DI2TODO2=2
	41	\|AT+DI2TORO2=2\|AT+DI2TORO2=2
4.2	42
	43
7.1	44
15.2	45	=== 2.2.3 Serial port display ===
12.2	46
15.2	47
12.2	48	(% class="wikigeneratedid" %)
4.2	49	[[image:image-20220602111219-2.png]]
	50
	51
12.2	52	(% class="wikigeneratedid" %)
4.2	53	[[image:image-20220602111219-3.png]]
	54
12.2	55	(% class="wikigeneratedid" %)
	56	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.
	57
	58
	59	== 2.2 Point To Mult-Point ==
	60
15.2	61	=== 2.2.1 Overview ===
12.2	62
	63
15.2	64	[[image:1654152390874-192.png]]
12.2	65
	66
15.2	67	=== 2.2.2 Configure ===
	68
	69
	70	(% style="color:#4f81bd" %)Configuration of the TX group:
	71
	72	AT+GROUPMOD=0,2
	73
	74	AT+TXCHS=868700000
	75
	76	AT+RXCHS=869000000
	77
	78	AT+TRIG1=2,50
	79
	80	AT+TRIG2=2,50
	81
	82	AT+DI1TODO1=1
	83
	84	AT+DI1TORO1=1
	85
	86	AT+DI2TODO2=1
	87
	88	AT+DI2TORO2=1
	89
	90
	91	(% style="color:#4f81bd" %)Configuration for RX group number 1:
	92
	93	AT+GROUPMOD=1,1
	94
	95	AT+TXCHS=869000000
	96
	97	AT+RXCHS=868700000
	98
	99
	100	(% style="color:#4f81bd" %)Configuration for RX group number 2:
	101
	102	AT+GROUPMOD=1,2
	103
	104	AT+TXCHS=869000000
	105
	106	AT+RXCHS=868700000
	107
	108
	109	=== 2.2.3 Serial port display ===
	110
	111
	112	[[image:image-20220602144747-1.png]]
	113
	114
	115	[[image:image-20220602144747-2.png]]
	116
8.9	117	(((
15.2	118	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	119	)))
4.2	120
8.2	121
15.2	122
	123
8.2	124	== 2.3 AT command ==
	125
	126
11.3	127	(((
8.6	128	(% style="color:#037691" %)ATZ (%%): Trig a reset of the MCU
11.3	129	)))
8.2	130
11.3	131	(((
8.6	132	(% style="color:#037691" %)AT+FDR (%%): Reset Parameters to Factory Default, Keys Reserve
11.3	133	)))
8.2	134
11.3	135	(((
8.6	136	(% style="color:#037691" %)AT+FCU (%%): Get or Set the Frame Counter Uplink
11.3	137	)))
8.2	138
11.3	139	(((
8.6	140	(% style="color:#037691" %)AT+FCD (%%): Get or Set the Frame Counter Downlink
11.3	141	)))
8.2	142
11.3	143	(((
8.6	144	(% style="color:#037691" %)AT+TXP (%%): Get or Set the transmit power, the maximum is 20dBm (default is 14dBm)
11.3	145	)))
8.2	146
11.3	147	(((
8.8	148	(% style="color:#037691" %)AT+SYNC (%%): Get or Set the Sync word [1:0x34,0:0x12] (default is 1)
11.3	149	)))
8.2	150
11.3	151	(((
8.7	152	(% style="color:#037691" %)AT+PMB (%%): Get or Set the preamble (default:8)
11.3	153	)))
8.2	154
11.3	155	(((
8.6	156	(% style="color:#037691" %)AT+TXCHS (%%): Get or Set the transmit frequency of TX (default:868700000)
11.3	157	)))
8.2	158
11.3	159	(((
8.6	160	(% style="color:#037691" %)AT+TXSF (%%): Get or Set the spreading factor of TX (7 to 12) (default:12)
11.3	161	)))
8.2	162
11.3	163	(((
8.6	164	(% style="color:#037691" %)AT+RXCHS (%%): Get or Set the transmit frequency of RX (default:869000000)
11.3	165	)))
8.2	166
11.3	167	(((
8.6	168	(% style="color:#037691" %)AT+RXSF (%%): Get or Set the spreading factor of RX (7 to 12) (default:12)
11.3	169	)))
8.2	170
11.3	171	(((
9.2	172	(% style="color:#037691" %)AT+BW (%%): Get or Set the bandwidth [0:125khz,1:250khz,2:500khz] (default:0)
11.3	173	)))
8.2	174
11.3	175	(((
8.7	176	(% 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	177	)))
8.2	178
11.3	179	(((
8.6	180	(% style="color:#037691" %)AT+TDC (%%): Get or set the application data transmission interval in ms(default 10 minutes)
11.3	181	)))
8.2	182
11.3	183	(((
8.8	184	(% style="color:#037691" %)AT+VER (%%): Get firmware version number
11.3	185	)))
8.2	186
11.3	187	(((
9.2	188	(% style="color:#037691" %)AT+SEND (%%): Set Custom sent hex data
11.3	189	)))
8.2	190
11.3	191	(((
8.6	192	(% style="color:#037691" %)AT+GROUPMOD (%%): Set or Get the grouping mode of the device (default: 0)
11.3	193	)))
8.2	194
11.1	195	(((
11.3	196	(((
8.7	197	(% 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	198	)))
11.3	199	)))
8.2	200
11.3	201	(((
8.6	202	(% style="color:#037691" %)AT+TRIG1 (%%): Set or Get the DI1 pin interrupt trigger mode (default 0,0)
11.3	203	)))
8.2	204
11.3	205	(((
8.7	206	(% style="color:#037691" %)AT+TRIG2 (%%): Set or Get the DI2 pin interrupt trigger mode (default 0,0)
11.3	207	)))
8.2	208
11.3	209	(((
8.7	210	(% style="color:#037691" %)AT+DI1TODO1 (%%): Set or get the mode in which DI1 maps to DO1 (default 0)
11.3	211	)))
8.2	212
11.3	213	(((
8.7	214	(% style="color:#037691" %)AT+DI1TORO1 (%%): Set or get the mode in which DI1 maps to RO1(default 0)
11.3	215	)))
8.2	216
11.3	217	(((
8.6	218	(% style="color:#037691" %)AT+DI2TODO2 (%%): Set or get the mode in which DI2 maps to DO2(default 0)
11.3	219	)))
8.2	220
11.3	221	(((
8.7	222	(% style="color:#037691" %)AT+DI2TORO2 (%%): Set or get the mode in which DI2 maps to RO2(default 0)
11.3	223	)))
8.2	224
11.3	225	(((
	226
	227	)))
8.2	228
11.3	229	(((
	230
	231	)))
8.2	232
11.3	233	(((
8.7	234	(% style="color:#4f81bd" %)Example 1:
11.3	235	)))
8.2	236
11.3	237	(((
8.7	238	AT+SEND=01020304 will send a payload of 01020304
11.3	239	)))
8.2	240
11.3	241	(((
	242
	243	)))
8.2	244
11.3	245	(((
8.7	246	(% style="color:#4f81bd" %)Example 2:
11.3	247	)))
8.2	248
11.3	249	(((
8.8	250	AT+TRIGx=a Trigger directly without triggering time
11.3	251	)))
8.2	252
11.3	253	(((
8.7	254	AT+TRIGx=a,b
11.3	255	)))
8.2	256
11.3	257	(((
8.7	258	a=0: falling edge;
11.3	259	)))
8.2	260
11.3	261	(((
8.7	262	a=1: rising edge;
11.3	263	)))
8.2	264
11.3	265	(((
8.7	266	a=2: falling edge or rising edge;
11.3	267	)))
8.2	268
11.3	269	(((
8.7	270	b: triggering time in milliseconds.
11.3	271	)))
8.2	272
11.3	273	(((
8.7	274	AT+TRIGx=2,50 Falling edge or rising edge trigger, and the trigger time exceeds 50ms.
11.3	275	)))
8.2	276
11.3	277	(((
	278
	279	)))
8.2	280
11.3	281	(((
8.7	282	(% style="color:#4f81bd" %)Example 3:
11.3	283	)))
8.2	284
11.3	285	(((
8.7	286	AT+DI1TODO1= maps value
11.3	287	)))
8.2	288
11.3	289	(((
8.7	290	AT+DI1TORO1= maps value
11.3	291	)))
8.2	292
11.3	293	(((
8.7	294	AT+DI2TODO2= maps value
11.3	295	)))
8.2	296
11.3	297	(((
8.7	298	AT+DI2TORO2= maps value
11.3	299	)))
8.7	300
11.3	301	(((
	302
	303	)))
8.7	304
8.4	305	(% border="1" style="background-color:#f7faff; color:black; width:706px" %)
11.3	306	\|=(% style="width: 102px;" %)(((
	307	Maps value
	308	)))\|=(% style="width: 331px;" %)(((
	309	DIx to DOx
	310	)))\|=(% style="width: 268px;" %)(((
	311	DIx to ROx
	312	)))
	313	\|(% style="width:102px" %)(((
	314	0
	315	)))\|(% style="width:331px" %)(((
	316	No Action
	317	)))\|(% style="width:268px" %)(((
	318	No Action
	319	)))
	320	\|(% style="width:102px" %)(((
	321	1
	322	)))\|(% style="width:331px" %)(((
	323	If DIx is high, control DOx to output low level, If DIx is low, control DOx to output high level
	324	)))\|(% style="width:268px" %)(((
	325	(((
8.2	326	If DIx is high, control ROx to close,
11.3	327	)))
8.2	328
11.3	329	(((
8.2	330	if DIx is low, control ROx to open
	331	)))
11.3	332	)))
	333	\|(% style="width:102px" %)(((
	334	2
	335	)))\|(% style="width:331px" %)(((
	336	If DIx is high, control DOx to output high level, If DIx is low, control DOx to output low level
	337	)))\|(% style="width:268px" %)(((
	338	(((
8.2	339	If DIx is high, control ROx to open,
11.3	340	)))
8.2	341
11.3	342	(((
8.2	343	if DIx is low, control ROx to close
	344	)))
11.3	345	)))
	346	\|(% style="width:102px" %)(((
	347	3
	348	)))\|(% style="width:331px" %)(((
	349	DOx state flip
	350	)))\|(% style="width:268px" %)(((
	351	ROx state flip
	352	)))
8.2	353
11.3	354	(((
8.7	355	(% style="color:#4f81bd" %)Example 4:
11.3	356	)))
8.2	357
11.3	358	(((
8.7	359	AT+GROUPMOD=0 Set to point to point mode
11.3	360	)))
8.2	361
11.3	362	(((
8.7	363	AT+GROUPMOD=0,aa Set the TX group that controls the number of aa (The maximum value of aa is 8)
11.3	364	)))
8.2	365
11.1	366	(((
11.3	367	(((
8.7	368	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	369	)))
11.3	370	)))
8.2	371
11.3	372	(((
8.7	373	AT+GROUPMOD=0,2 Set to control the TX group of the two RX groups
11.3	374	)))
8.2	375
11.3	376	(((
8.7	377	AT+GROUPMOD=1,1 Set the RX group numbered 1
11.3	378	)))
8.2	379
11.3	380	(((
8.7	381	AT+GROUPMOD=1,2 Set the RX group numbered 2
11.3	382	)))
8.2	383
	384
	385	== 2.4 Data Format ==
	386
11.3	387	(((
8.2	388	8 bytes of GROUPID + 9 bytes of payload + 4 bytes of checksum
11.3	389	)))
8.2	390
11.3	391	(((
	392
	393	)))
8.2	394
11.3	395	(((
8.8	396	(% style="color:#4f81bd" %)Payload:
11.3	397	)))
8.2	398
8.4	399	(% border="1" style="background-color:#f7faff; color:black; width:938px" %)
11.3	400	\|=(% style="width: 123px;" %)(((
	401	Size (bytes)
	402	)))\|=(% style="width: 107px;" %)(((
	403	1
	404	)))\|=(% style="width: 107px;" %)(((
	405	1
	406	)))\|=(% style="width: 107px;" %)(((
	407	1
	408	)))\|=(% style="width: 107px;" %)(((
	409	1
	410	)))\|=(% style="width: 107px;" %)(((
	411	1
	412	)))\|=(% style="width: 107px;" %)(((
	413	1
	414	)))\|=(% style="width: 107px;" %)(((
	415	1
	416	)))\|=(% style="width: 107px;" %)(((
	417	1
	418	)))\|=(% style="width: 107px;" %)(((
	419	1
	420	)))
	421	\|(% style="width:123px" %)(((
	422	Value
	423	)))\|(% style="width:38px" %)(((
	424	address
	425	)))\|(% style="width:70px" %)(((
	426	request
	427	)))\|(% style="width:52px" %)(((
	428	ACK
	429	)))\|(% style="width:127px" %)(((
	430	(((
8.2	431	DI1&
11.3	432	)))
8.2	433
11.3	434	(((
8.2	435	DI1 level
11.3	436	)))
	437	)))\|(% style="width:101px" %)(((
	438	DI1TODO1
	439	)))\|(% style="width:91px" %)(((
	440	DI1TORO1
	441	)))\|(% style="width:111px" %)(((
	442	(((
8.2	443	DI2&
11.3	444	)))
8.2	445
11.3	446	(((
8.2	447	DI2 level
11.3	448	)))
	449	)))\|(% style="width:105px" %)(((
	450	DI2TODO2
	451	)))\|(% style="width:106px" %)(((
	452	DI2TORO2
	453	)))
8.2	454
11.3	455	(((
8.5	456	(% style="color:#037691" %)The first byte(%%): 00 is the broadcast address, 01-08 is the RX group number.
11.3	457	)))
8.2	458
11.3	459	(((
8.5	460	(% style="color:#037691" %)The second byte(%%): send mapping request when not 0, not request when it is 0.
11.3	461	)))
8.2	462
11.3	463	(((
8.5	464	(% style="color:#037691" %)The third byte(%%): ACK returned to the sender after the mapping is completed.
11.3	465	)))
8.2	466
11.1	467	(((
11.3	468	(((
8.5	469	(% 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	470	)))
11.3	471	)))
8.2	472
11.3	473	(((
8.6	474	(% style="color:#037691" %)The Fifth byte(%%): DI1TODO1 when the interrupt is triggered, 0 when the interrupt is not triggered.
11.3	475	)))
8.2	476
11.3	477	(((
8.5	478	(% style="color:#037691" %)The Sixth byte(%%): 0 does not trigger interrupt when DI1TORO1 interrupt is triggered.
11.3	479	)))
8.2	480
11.1	481	(((
11.3	482	(((
8.5	483	(% 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	484	)))
11.3	485	)))
8.2	486
11.3	487	(((
8.6	488	(% style="color:#037691" %)The 8th byte(%%): DI2TODO2 when the interrupt is triggered, 0 when the interrupt is not triggered.
11.3	489	)))
8.2	490
11.3	491	(((
8.5	492	(% style="color:#037691" %)The 9th byte(%%): DI2TORO2 when an interrupt is triggered, 0 when an interrupt is not triggered.
11.3	493	)))
8.2	494
1.1	495

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