Last modified by Bei Jinggeng on 2022/12/19 11:05
Show last authors
1 (% class="wikigeneratedid" %)
2 **Table of Contents:**
3
4 {{toc/}}
5
6
7
8 = 1.  Overview =
9
10
11 This instruction is for how to use Peer to Peer firmware in LA66.
12
13
14
15 = 2.  Firmware Location =
16
17
18 Click[[ here>>https://www.dropbox.com/sh/dq03kkfdrqnhy66/AACpHIcKYMa4o1IySKtVoeENa?dl=0]] to download the firmware and update it to LA66 according to the instruction for different boards.
19
20
21
22 = 3.  How to use? =
23
24
25 == 3.1  AT command ==
26
27
28 (% style="color:blue" %)**1). Lora parameter configuration:**
29
30
31 AT+FRE:  Get or Set TX and RX frequency
32
33 AT+BW:  Get or Set TX and RX BandWidth
34
35 AT+SF:  Get or Set TX and RX Spreading Factor
36
37 AT+POWER:  Get or Set Tx Power Range
38
39 AT+CRC:  Get or Set TX and RX CRC Type
40
41 AT+HEADER:  Get or Set TX and RX Header Type
42
43 AT+CR:  Get or Set TX and RX Header Type
44
45 AT+IQ:  Get or Set TX and RX InvertIQ
46
47 AT+PREAMBLE:  Get or Set TX and RX Preamble Length
48
49 AT+SYNCWORD:  Get or Set sync word
50
51
52
53 (% style="color:blue" %)**2). General configuration:**
54
55
56 ATZ:  Trig a reset of the MCU
57
58 AT+FDR:  Reset Parameters to Factory Default
59
60 AT+CFG:  Print all configurations
61
62 AT+FCU:  Get or Set the Frame Counter Uplink
63
64 AT+FCD:  Get or Set the Frame Counter Downlink
65
66 AT+GROUPMOD:  Get or Set TX and RX group
67
68 AT+RXMOD:  Get or Set Rx Timeout and Reply mode
69
70 AT+SEND:  Send text data or hex along with the application port and confirm status
71
72 AT+RECV:  Print last receive message, RSSI and SNR
73
74
75
76 == 3.2  Serial port information ==
77
78
79 (% style="color:blue" %)**1). Information initialized at reset：**
80
81 [[image:image-20220926112125-1.png]]
82
83
84 (% style="color:blue" %)**2). In retransmission, the Uplinkcounter does not accumulate. The following figure shows that the third count packet is retransmitted twice when the ACK packet is not received.**
85
86
87 [[image:image-20220926112125-2.png]]
88
89
90 (% style="color:blue" %)**3). In the figure below, the receiver sends an ACK to the sender after receiving the packet, and the sender stops retransmission after receiving the ACK.**
91
92
93 (% style="color:red" %)**Receiver: (configured as AT+RXMOD=65535,2)**
94
95 [[image:image-20220926112125-3.png]]
96
97
98
99 (% style="color:red" %)**Sender:**
100
101 [[image:image-20220926112125-4.png]]
102
103
104
105 == 3.3  Data Format ==
106
107
108 1 byte of TXGROUPMOD +n payload
109
110
111 Payload(S12, SF11, SF10 maximum length is 59, SF9 maximum length is 123, SF8, SF7 maximum length is 230):
112
113 (% border="1" style="background-color:#ffffcc; color:green; width:316px" %)
114 |=(% style="width: 105px;" %)**Size (bytes)**|=(% style="width: 109px;" %)** 1**|=(% style="width: 99px;" %)**payloadsize**
115 |(% style="width:105px" %)**Value**|(% style="width:109px" %)TXGroupmod|(% style="width:99px" %)Send data
116
117
118
119 = 4.  AT Command Set =
120
121
122 == 4.1  Set TX and RX Bandwidth ==
123
124
125 **Set TX and RX BandWidth (0 ~~ 9), (% style="color:blue" %)AT Command :  AT+BW(%%)**
126
127 0:  125 kHz
128
129 1:  250 kHz
130
131 2:  500 kHz
132
133 3:  62.5 kHz
134
135 4:  41.67 kHz
136
137 5:  31.25 kHz
138
139 6:  20.83 kHz
140
141 7:  15.63 kHz
142
143 8:  10.42 kHz
144
145 9:  7.81 kHz
146
147
148 (% style="color:red" %)**Default Value: AT+BW=0,0**  (%%) ~/~/  BandWidth: 125kHz ,125kHz
149
150 (% style="color:red" %)**Range: (0 ~~ 9)**
151
152
153
154 == 4.2  Set TX and RX frequency ==
155
156
157 **Set TX and RX frequency (MHz), (% style="color:blue" %)AT Command :  AT+FRE(%%)**
158
159
160 (% style="color:red" %)**Default Value: AT+FRE=868.100,868.100**  (%%) ~/~/  Frequency: 868.100MHz, 868.100MHz
161
162
163
164 == 4.3  Set TX and RX Spreading Factor ==
165
166
167 **Set TX and RX Spreading Factor ( 5 ~~ 12), (% style="color:blue" %)AT Command : AT+SF(%%)**
168
169
170 (% style="color:red" %)**Default Value: AT+SF=12,12**  (%%) ~/~/  Spreading Factor : 12,12
171
172 (% style="color:red" %)**Range: (5 ~~ 12)**
173
174
175
176 == 4.4  Set Tx Power Range ==
177
178
179 **Set Tx Power Range( 0 ~~ 22 dBm), (% style="color:blue" %)AT Command : AT+POWER(%%)**
180
181
182 (% style="color:red" %)**Default Value: AT+POWER=20**  (%%) ~/~/  Output Power: 20dBm
183
184 (% style="color:red" %)**Range: (0 ~~ 22)**
185
186
187
188 == 4.5  Set TX and RX Coding Rate ==
189
190
191 **Set TX and RX Coding Rate ( 1 ~~ 4 ), (% style="color:blue" %)AT Command ：AT+CR(%%)**
192
193 1: 4/5
194
195 2: 4/6
196
197 3: 4/7
198
199 4: 4/8
200
201
202 (% style="color:red" %)**Default Value: AT+CR=1,1**  (%%) ~/~/  Coding Rate: 4/5, 4/5
203
204 (% style="color:red" %)**Range: (1 ~~ 4)**
205
206
207
208 == 4.6  Set TX and RX Header Type ==
209
210
211 **Set TX and RX Header Type ( 0,1 ), (% style="color:blue" %)AT Command : AT+HEADER(%%)**
212
213 0: Variable length packet (explicit header)
214
215 1: Fixed length packet (implicit header)
216
217
218 (% style="color:red" %)**Default Value: AT+HEADER=1,1**  (%%) ~/~/  Header Type: explicit, explicit
219
220 (% style="color:red" %)**Range: (0 ~~ 1)**
221
222
223
224 == 4.7  Set TX and RX CRC Type ==
225
226
227 **Set TX and RX CRC Type ( 0,1) ,(% style="color:blue" %)AT Command：AT+CRC(%%)**
228
229 0: CRC OFF
230
231 1: CRC ON
232
233
234 (% style="color:red" %)**Default Value: AT+CRC=0,0**  (%%) ~/~/  CRC: OFF, OFF
235
236 (% style="color:red" %)**Range: (0 ~~ 1)**
237
238
239
240 == 4.8  Set TX and RX InvertIQ ==
241
242
243 **Set TX and RX InvertIQ ( 0,1) , (% style="color:blue" %)AT Command：AT+IQ(%%)**
244
245 0: Standard IQ setup
246
247 1: Inverted IQ setup
248
249
250 (% style="color:red" %)**Default Value: AT+IQ=0,0**  (%%) ~/~/  Invert IQ: 0,0
251
252 (% style="color:red" %)**Range: (0 ~~ 1)**
253
254
255
256 == 4.9  Set TX and RX Preamble Length ==
257
258
259 **Set TX and RX Preamble Length ( 0 ~~ 65535 ) , (% style="color:blue" %)AT Command： AT+PREAMBLE(%%)**
260
261
262 (% style="color:red" %)**Default Value: AT+PREAMBLE=8,8**  (%%) ~/~/  Preamble: 8,8
263
264 (% style="color:red" %)**Range: ( 0 ~~ 65535 )**
265
266
267
268 == 4.10  Set Syncword ==
269
270
271 **Set Syncword(0: private，1: public), (% style="color:blue" %)AT Command : AT+SYNCWORD(%%)**
272
273
274 (% style="color:red" %)**Default Value: AT+SYNCWORD=0**  (%%) ~/~/  0x3444 for Public Network
275
276 (% style="color:red" %)**Range: ( 0 ~~ 1 )**
277
278
279
280 == 4.11  Set TX and RX group ==
281
282
283 **Set TX and RX group. (0 ~~ 255)，(% style="color:blue" %)AT Command：AT+GROUPMOD(%%)**
284
285 Group > 0:  Device only accept same group transmision
286
287 Group = 0:  Accept Any group
288
289
290 (% style="color:red" %)**Default Value: AT+GROUPMOD=0,0**  (%%) ~/~/  Group: 0,0
291
292 (% style="color:red" %)**Range: ( 0 ~~ 255 )**
293
294
295
296
297 == 4.12  Set Rx Timeout and Reply mode ==
298
299
300 **Set Rx Timeout and Reply mode, Parameter 1, Parameter2， (% style="color:blue" %)AT Command：AT+RXMOD(%%)**
301
302 **Parameter 1: **
303
304 0:  Always no RX
305
306 1 ~~ 65534:  Open RX window and last for specify seconds.
307
308 65535:  RX window always open.
309
310
311 **~ Parameter 2: **
312
313 0:  No ACK
314
315 1:  Send an ACK once got a message from another device. ACK Content is same as receive message
316
317 2:  Send an ACK once got a message from another device. ACK Content is 0x00 FF
318
319
320 (% style="color:red" %)**Default Value: AT+RXMOD=65535,2**  (%%) ~/~/  RX Mode: 65535, 2
321
322
323
324 == 4.13  Send Message ==
325
326
327 **Send Message， (% style="color:blue" %)AT Command：AT+SEND(%%)**
328
329 **Parameter 1:** send hex or text
330
331 0: Send hex
332
333 1: Send text
334
335
336 **Parameter 2:** Content
337
338
339 **Parameter 3 :** ACK Type
340
341 0: No ACK
342
343 1: Wait for ACK (Same as what we sent)
344
345 2: Wait for ACK ( 0x00 FF)
346
347
348 **Parameter 4 :** Retransmission ( 0 ~~ 8 )
349
350 0: No re-transmission
351
352 1 ~~ 8: total sends 1~~8 transmission, interval 5 seconds
353
354
355 Example:  AT+SEND=1,hello world,0,3
356
357 (% style="color:red" %)**Notice: RX reply (Defined by AT+RXMOD) won't ask for TX ACK**
358
359
360
361 == 4.14  Print last receive message with RSSI and SNR ==
362
363
364 **Print last receive message with RSSI and SNR，(% style="color:blue" %)AT+Command：AT+RECV(%%)**
365
366 0: Print in Hex
367
368 1: Print in text
369
370
371 Example: AT+RECV=0 
372 \\The recevied message will be clear after this command.
373
374
375
376
377
378
379
380
381
382

Applications

Navigation

Copyright ©2010-2022 Dragino Technology Co., LTD. All rights reserved
Dragino Wiki v2.0