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

Version 12.2 by Xiaoling on 2022/06/02 14:46

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

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

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