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

Version 15.2 by Xiaoling on 2022/06/02 14:51

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

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