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

Version 11.3 by Xiaoling on 2022/06/02 14:34

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

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

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