<
From version < 100.2 >
edited by Xiaoling
on 2022/08/08 16:01
To version < 104.7 >
edited by Xiaoling
on 2022/09/15 15:02
>
Change comment: There is no comment for this version

Summary

Details

Page properties
Content
... ... @@ -16,6 +16,7 @@
16 16  
17 17  = 1.  Introduction =
18 18  
19 +
19 19  == 1.1 ​ What is NDDS75 Distance Detection Sensor ==
20 20  
21 21  (((
... ... @@ -118,6 +118,8 @@
118 118  ​
119 119  
120 120  
122 +
123 +
121 121  == 1.5  Pin Definitions ==
122 122  
123 123  
... ... @@ -127,6 +127,7 @@
127 127  
128 128  = 2.  Use NDDS75 to communicate with IoT Server =
129 129  
133 +
130 130  == 2.1  How it works ==
131 131  
132 132  
... ... @@ -200,15 +200,16 @@
200 200  
201 201  [[image:image-20220709092052-2.png]]
202 202  
203 -**Connection:**
204 204  
205 - (% style="background-color:yellow" %)USB TTL GND <~-~-~-~-> GND
208 +(% style="color:blue" %)**Connection:**
206 206  
207 - (% style="background-color:yellow" %)USB TTL TXD <~-~-~-~-> UART_RXD
210 + (% style="background-color:yellow" %)**USB TTL GND <~-~-~-~-> GND**
208 208  
209 - (% style="background-color:yellow" %)USB TTL RXD <~-~-~-~-> UART_TXD
212 +**~ (% style="background-color:yellow" %)USB TTL TXD <~-~-~-~-> UART_RXD(%%)**
210 210  
214 +**~ (% style="background-color:yellow" %)USB TTL RXD <~-~-~-~-> UART_TXD(%%)**
211 211  
216 +
212 212  In the PC, use below serial tool settings:
213 213  
214 214  * Baud:  (% style="color:green" %)**9600**
... ... @@ -223,8 +223,9 @@
223 223  
224 224  [[image:1657329814315-101.png]]
225 225  
231 +
226 226  (((
227 -(% style="color:red" %)Note: the valid AT Commands can be found at: (%%)[[https:~~/~~/www.dragino.com/downloads/index.php?dir=NB-IoT/NDDS75/>>url:https://www.dragino.com/downloads/index.php?dir=NB-IoT/NDDS75/]]
233 +(% style="color:red" %)**Note: the valid AT Commands can be found at: **(%%)**[[https:~~/~~/www.dropbox.com/sh/aaq2xcl0bzfu0yd/AAAEAHRa7Io_465ds4Y7-F3aa?dl=0>>https://www.dropbox.com/sh/aaq2xcl0bzfu0yd/AAAEAHRa7Io_465ds4Y7-F3aa?dl=0]]**
228 228  )))
229 229  
230 230  
... ... @@ -243,21 +243,29 @@
243 243  (% style="color:blue" %)**AT+PRO=1**  (%%) ~/~/ Set to use CoAP protocol to uplink
244 244  )))
245 245  * (((
246 -(% style="color:blue" %)**AT+SERVADDR=120.24.4.116,5683   ** (%%)~/~/ to set CoAP server address and port
252 +(% style="color:blue" %)**AT+SERVADDR=120.24.4.116,5683   ** (%%)~/~/  to set CoAP server address and port
247 247  )))
248 248  * (((
249 -(% style="color:blue" %)**AT+URI=5,11,"mqtt",11,"coap",12,"0",15,"c=text1",23,"0" ** (%%) ~/~/Set COAP resource path
255 +(% style="color:blue" %)**AT+URI=5,11,"mqtt",11,"coap",12,"0",15,"c=text1",23,"0" ** (%%) ~/~/  Set COAP resource path
256 +
257 +
258 +
250 250  )))
251 251  
252 252  (((
253 253  For parameter description, please refer to AT command set
263 +
264 +
254 254  )))
255 255  
256 256  [[image:1657330452568-615.png]]
257 257  
258 258  
270 +
259 259  (((
260 260  After configure the server address and (% style="color:green" %)**reset the device**(%%) (via AT+ATZ ), NDDS75 will start to uplink sensor values to CoAP server.
273 +
274 +
261 261  )))
262 262  
263 263  [[image:1657330472797-498.png]]
... ... @@ -267,10 +267,12 @@
267 267  === 2.2.5 Use UDP protocol to uplink data(Default protocol) ===
268 268  
269 269  
270 -* (% style="color:blue" %)**AT+PRO=2   ** (%%) ~/~/ Set to use UDP protocol to uplink
271 -* (% style="color:blue" %)**AT+SERVADDR=120.24.4.116,5601   ** (%%) ~/~/ to set UDP server address and port
272 -* (% style="color:blue" %)**AT+CFM=1       ** (%%) ~/~/ If the server does not respond, this command is unnecessary
284 +* (% style="color:blue" %)**AT+PRO=2   ** (%%) ~/~/  Set to use UDP protocol to uplink
285 +* (% style="color:blue" %)**AT+SERVADDR=120.24.4.116,5601   ** (%%) ~/~/  to set UDP server address and port
286 +* (% style="color:blue" %)**AT+CFM=1       ** (%%) ~/~/  If the server does not respond, this command is unnecessary
273 273  
288 +
289 +
274 274  [[image:1657330501006-241.png]]
275 275  
276 276  
... ... @@ -281,13 +281,13 @@
281 281  === 2.2.6 Use MQTT protocol to uplink data ===
282 282  
283 283  
284 -* (% style="color:blue" %)**AT+PRO=3   ** (%%) ~/~/Set to use MQTT protocol to uplink
285 -* (% style="color:blue" %)**AT+SERVADDR=120.24.4.116,1883   ** (%%) ~/~/Set MQTT server address and port
286 -* (% style="color:blue" %)**AT+CLIENT=CLIENT       ** (%%)~/~/Set up the CLIENT of MQTT
287 -* (% style="color:blue" %)**AT+UNAME=UNAME                                **(%%)~/~/Set the username of MQTT
288 -* (% style="color:blue" %)**AT+PWD=PWD                                         **(%%)~/~/Set the password of MQTT
289 -* (% style="color:blue" %)**AT+PUBTOPIC=NDDS75_PUB                 **(%%)~/~/Set the sending topic of MQTT
290 -* (% style="color:blue" %)**AT+SUBTOPIC=NDDS75_SUB          **(%%) ~/~/Set the subscription topic of MQTT
300 +* (% style="color:blue" %)**AT+PRO=3   ** (%%) ~/~/  Set to use MQTT protocol to uplink
301 +* (% style="color:blue" %)**AT+SERVADDR=120.24.4.116,1883   ** (%%) ~/~/  Set MQTT server address and port
302 +* (% style="color:blue" %)**AT+CLIENT=CLIENT       ** (%%)~/~/  Set up the CLIENT of MQTT
303 +* (% style="color:blue" %)**AT+UNAME=UNAME                                **(%%)~/~/  Set the username of MQTT
304 +* (% style="color:blue" %)**AT+PWD=PWD                                         **(%%)~/~/  Set the password of MQTT
305 +* (% style="color:blue" %)**AT+PUBTOPIC=NDDS75_PUB                 **(%%)~/~/  Set the sending topic of MQTT
306 +* (% style="color:blue" %)**AT+SUBTOPIC=NDDS75_SUB          **(%%) ~/~/  Set the subscription topic of MQTT
291 291  
292 292  [[image:1657249978444-674.png]]
293 293  
... ... @@ -304,8 +304,8 @@
304 304  === 2.2.7 Use TCP protocol to uplink data ===
305 305  
306 306  
307 -* (% style="color:blue" %)**AT+PRO=4   ** (%%) ~/~/ Set to use TCP protocol to uplink
308 -* (% style="color:blue" %)**AT+SERVADDR=120.24.4.116,5600   **(%%) ~/~/ to set TCP server address and port
323 +* (% style="color:blue" %)**AT+PRO=4   ** (%%) ~/~/  Set to use TCP protocol to uplink
324 +* (% style="color:blue" %)**AT+SERVADDR=120.24.4.116,5600   **(%%) ~/~/  to set TCP server address and port
309 309  
310 310  [[image:image-20220709093918-1.png]]
311 311  
... ... @@ -319,24 +319,31 @@
319 319  
320 320  User can use below command to change the (% style="color:green" %)**uplink interval**.
321 321  
322 -* (% style="color:blue" %)**AT+TDC=600      ** (%%)~/~/ Set Update Interval to 600s
338 +* (% style="color:blue" %)**AT+TDC=600      ** (%%)~/~/  Set Update Interval to 600s
323 323  
324 324  (((
341 +
342 +
343 +
325 325  (% style="color:red" %)**NOTE:**
326 -)))
327 327  
328 -(((
329 329  (% style="color:red" %)**1. By default, the device will send an uplink message every 1 hour.**
347 +
348 +(% style="color:red" %)**2. When the firmware version is v1.3.2 and later firmware:**
330 330  )))
331 331  
351 +(% style="color:red" %)**By default, the device will send an uplink message every 2 hours. Each Uplink Include 8 set of records in this 2 hour (15 minute interval / record).**
332 332  
333 333  
354 +
334 334  == 2.3  Uplink Payload ==
335 335  
336 336  
337 -In this mode, uplink payload includes in total 14 bytes
358 +=== 2.3.1  Before Firmware v1.3.2 ===
338 338  
339 339  
361 +In this mode, uplink payload includes in total 14 bytes
362 +
340 340  (% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:440px" %)
341 341  |=(% style="width: 60px;" %)(((
342 342  **Size(bytes)**
... ... @@ -350,8 +350,9 @@
350 350  
351 351  [[image:1657331036973-987.png]]
352 352  
376 +
353 353  (((
354 -The payload is ASCII string, representative same HEX:
378 +The payload is **ASCII** string, representative same HEX:
355 355  )))
356 356  
357 357  (((
... ... @@ -362,11 +362,11 @@
362 362  Device ID: 0x724031556159 = 724031556159
363 363  )))
364 364  * (((
365 -Version: 0x0064=100=1.0.0
389 +Version:  0x0064=100=1.0.0
366 366  )))
367 367  
368 368  * (((
369 -BAT: 0x0c6c = 3180 mV = 3.180V
393 +BAT:  0x0c6c = 3180 mV = 3.180V
370 370  )))
371 371  * (((
372 372  Signal: 0x19 = 25
... ... @@ -379,9 +379,43 @@
379 379  
380 380  
381 381  
406 +
382 382  
383 383  )))
384 384  
410 +=== **2.3.2  Since firmware v1.3.2** ===
411 +
412 +
413 +In this mode, uplink payload includes 69 bytes in total by default.
414 +
415 +Each time the device uploads a data package, 8 sets of recorded data will be attached. Up to 32 sets of recorded data can be uploaded.
416 +
417 +(% border="2" style="background-color:#ffffcc; color:green; width:896px" %)
418 +|(% style="width:95px" %)**Size(bytes)**|(% style="width:84px" %)**8**|(% style="width:44px" %)2|(% style="width:48px" %)2|(% style="width:123px" %)1|(% style="width:55px" %)1|(% style="width:80px" %)1|(% style="width:77px" %)2|(% style="width:94px" %)4|(% style="width:77px" %)2|(% style="width:116px" %)4
419 +|(% style="width:95px" %)**Value**|(% style="width:84px" %)Device ID|(% style="width:44px" %)Ver|(% style="width:48px" %)BAT|(% style="width:123px" %)Signal Strength|(% style="width:55px" %)MOD|(% style="width:80px" %)Interrupt|(% style="width:77px" %)Distance|(% style="width:94px" %)Timestamp|(% style="width:77px" %)Distance|(% style="width:116px" %)Timestamp.......
420 +
421 +If we use the MQTT client to subscribe to this MQTT topic, we can see the following information when the NDDS75 uplink data.
422 +
423 +[[image:image-20220908175246-1.png]]
424 +
425 +
426 +The payload is ASCII string, representative same HEX:
427 +
428 +0x(% style="color:red" %)f867787050213317(% style="color:blue" %)0084(% style="color:green" %)0cf4(% style="color:red" %)1e(% style="color:blue" %)01(% style="color:green" %)00(% style="color:red" %)**//00396319bb32//**00396319baf0//**00396319ba3c**//00396319b988//**00396319b8d4**//00396319b820//**00396319b76c**//00396319b6b8//**00396319b604**//(%%) where:
429 +
430 +* (% style="color:green" %)Device ID: f867787050213317 = f867787050213317
431 +* (% style="color:red" %)Version: 0x0084=132=1.3.2
432 +* (% style="color:green" %)BAT: 0x0cf4 = 3316 mV = 3.316V
433 +* (% style="color:blue" %)Singal: 0x1e = 30
434 +* (% style="color:red" %)Mod: 0x01 = 1
435 +* Interrupt: 0x00= 0
436 +* Distance: 0x0039= 57 = 57
437 +* Time stamp : 0x6315537b =1662342011  ([[Unix Epoch Time>>url:http://www.epochconverter.com/]])
438 +* Distance,Time stamp : 00396319baf0
439 +* (% style="color:red" %) 8 sets of recorded data: Distance,Time stamp : //**00396319ba3c**//,.......
440 +
441 +
442 +
385 385  == 2.4  Payload Explanation and Sensor Interface ==
386 386  
387 387  
... ... @@ -394,10 +394,12 @@
394 394  
395 395  (((
396 396  User can use (% style="color:blue" %)**AT+DEUI**(%%) to set Device ID
455 +
456 +
397 397  )))
398 398  
399 399  (((
400 -**Example:**
460 +(% style="color:blue" %)**Example :**
401 401  )))
402 402  
403 403  (((
... ... @@ -405,11 +405,23 @@
405 405  )))
406 406  
407 407  (((
408 -The Device ID is stored in a none-erase area, Upgrade the firmware or run **AT+FDR** won't erase Device ID.
468 +The Device ID is stored in a none-erase area, Upgrade the firmware or run (% style="color:blue" %)**AT+FDR**(%%) won't erase Device ID.
409 409  )))
410 410  
411 411  
472 +(% style="color:red" %)**NOTE: When the firmware version is v1.3.2 and later firmware:**
412 412  
474 +(% style="color:red" %)**By default, the Device ID equal to the last 15 bits of IMEI.**
475 +
476 +User can use (% style="color:blue" %)**AT+DEUI**(%%) to set Device ID
477 +
478 +
479 +(% style="color:blue" %)**Example :**
480 +
481 +AT+DEUI=868411056754138
482 +
483 +
484 +
413 413  === 2.4.2  Version Info ===
414 414  
415 415  
... ... @@ -504,7 +504,7 @@
504 504  )))
505 505  
506 506  (((
507 -(% style="color:blue" %)**AT+INTMOD=3 **(%%) ~/~/(more info about INMOD please refer [[**AT Command Manual**>>url:https://www.dragino.com/downloads/downloads/NB-IoT/NBSN95/DRAGINO_NBSN95-NB_AT%20Commands_v1.1.0.pdf]])**.**
579 +(% style="color:blue" %)**AT+INTMOD=3 **(%%) ~/~/  (more info about INMOD please refer [[**AT Command Manual**>>url:https://www.dragino.com/downloads/downloads/NB-IoT/NBSN95/DRAGINO_NBSN95-NB_AT%20Commands_v1.1.0.pdf]])**.**
508 508  )))
509 509  
510 510  
... ... @@ -537,10 +537,14 @@
537 537  
538 538  (((
539 539  The 5V output time can be controlled by AT Command.
612 +
613 +
540 540  )))
541 541  
542 542  (((
543 543  (% style="color:blue" %)**AT+5VT=1000**
618 +
619 +
544 544  )))
545 545  
546 546  (((
... ... @@ -602,9 +602,52 @@
602 602  
603 603  
604 604  
605 -== 2.6  ​LED Indicator ==
681 +== 2.6  Distance alarm function(Since firmware v1.3.2) ==
606 606  
607 607  
684 +(% style="color:blue" %)** ➢ AT Command:**
685 +
686 +(% style="color:#037691" %)** AT+ LDDSALARM=min,max**
687 +
688 +² When min=0, and max≠0, Alarm higher than max
689 +
690 +² When min≠0, and max=0, Alarm lower than min
691 +
692 +² When min≠0 and max≠0, Alarm higher than max or lower than min
693 +
694 +
695 +(% style="color:blue" %)** Example:**
696 +
697 +**AT+ LDDSALARM=260,2000**  ~/~/ Alarm when distance lower than 260.
698 +
699 +
700 +
701 +== 2.7  Set the number of data to be uploaded and the recording time ==
702 +
703 +
704 +(% style="color:blue" %)** ➢ AT Command:**
705 +
706 +* (% style="color:#037691" %)** AT+TR=900** (%%) ~/~/ The unit is seconds, and the default is to record data once every 900 seconds.( The minimum can be set to 180 seconds)
707 +* (% style="color:#037691" %)** AT+NOUD=8**  (%%) ~/~/  The device uploads 8 sets of recorded data by default. Up to 32 sets of record data can be uploaded.
708 +
709 +
710 +
711 +
712 +== 2.8  Read or Clear cached data ==
713 +
714 +
715 +(% style="color:blue" %)** ➢ AT Command:**
716 +
717 +* (% style="color:#037691" %)** AT+CDP ** (%%) ~/~/  Read cached data
718 +* (% style="color:#037691" %)** AT+CDP=0**  (%%) ~/~/  Clear cached data
719 +
720 +[[image:image-20220908175333-2.png]]
721 +
722 +
723 +
724 +== 2.9  ​LED Indicator ==
725 +
726 +
608 608  The NDDS75 has an internal LED which is to show the status of different state.
609 609  
610 610  
... ... @@ -619,29 +619,29 @@
619 619  
620 620  
621 621  
622 -== 2.7  ​Firmware Change Log ==
741 +== 2.10  ​Firmware Change Log ==
623 623  
624 624  
625 625  (((
626 -Download URL & Firmware Change log
745 +Download URL & Firmware Change log:  [[https:~~/~~/www.dropbox.com/sh/3hb94r49iszmstx/AADvSJcXxahEUfxqKWVnZx-La?dl=0>>https://www.dropbox.com/sh/3hb94r49iszmstx/AADvSJcXxahEUfxqKWVnZx-La?dl=0]]
627 627  )))
628 628  
629 629  (((
630 -[[https:~~/~~/www.dragino.com/downloads/index.php?dir=NB-IoT/NDDS75/Firmware/>>url:https://www.dragino.com/downloads/index.php?dir=NB-IoT/NDDS75/Firmware/]]
749 +
631 631  )))
632 632  
633 -
634 634  (((
635 -Upgrade Instruction: [[Upgrade_Firmware>>||anchor="H5.1200BHowtoUpgradeFirmware"]]
753 +Upgrade Instruction: [[Upgrade Firmware>>||anchor="H5.1200BHowtoUpgradeFirmware"]]
636 636  )))
637 637  
638 638  
639 639  
640 -== 2.8  ​Battery Analysis ==
758 +== 2.11  ​Battery Analysis ==
641 641  
642 -=== 2.8.1  ​Battery Type ===
643 643  
761 +=== 2.11.1  ​Battery Type ===
644 644  
763 +
645 645  (((
646 646  The NDDS75 battery is a combination of an 8500mAh Li/SOCI2 Battery and a Super Capacitor. The battery is none-rechargeable battery type with a low discharge rate (<2% per year). This type of battery is commonly used in IoT devices such as water meter.
647 647  )))
... ... @@ -664,7 +664,7 @@
664 664  
665 665  
666 666  
667 -=== 2.8.2  Power consumption Analyze ===
786 +=== 2.11.2  Power consumption Analyze ===
668 668  
669 669  
670 670  (((
... ... @@ -703,7 +703,7 @@
703 703  
704 704  
705 705  
706 -=== 2.8.3  ​Battery Note ===
825 +=== 2.11.3  ​Battery Note ===
707 707  
708 708  
709 709  (((
... ... @@ -712,7 +712,7 @@
712 712  
713 713  
714 714  
715 -=== 2.8.4  Replace the battery ===
834 +=== 2.11.4  Replace the battery ===
716 716  
717 717  
718 718  (((
... ... @@ -730,6 +730,8 @@
730 730  
731 731  (((
732 732  The AT Command set can refer the BC35-G NB-IoT Module AT Command: [[https:~~/~~/www.dragino.com/downloads/index.php?dir=datasheet/other_vendors/BC35-G/>>url:https://www.dragino.com/downloads/index.php?dir=datasheet/other_vendors/BC35-G/]] 
852 +
853 +
733 733  )))
734 734  
735 735  [[image:1657333200519-600.png]]
... ... @@ -738,85 +738,103 @@
738 738  
739 739  = 4.  Using the AT Commands =
740 740  
862 +
741 741  == 4.1  Access AT Commands ==
742 742  
743 743  
744 -See this link for detail: [[https:~~/~~/www.dragino.com/downloads/index.php?dir=NB-IoT/NDDS75/>>url:http://www.dragino.com/downloads/index.php?dir=NB-IoT/NBSN50/]]
866 +See this link for detail:  [[https:~~/~~/www.dropbox.com/sh/aaq2xcl0bzfu0yd/AAAEAHRa7Io_465ds4Y7-F3aa?dl=0>>https://www.dropbox.com/sh/aaq2xcl0bzfu0yd/AAAEAHRa7Io_465ds4Y7-F3aa?dl=0]]
745 745  
746 746  
747 -AT+<CMD>?  : Help on <CMD>
869 +AT+<CMD>?  :  Help on <CMD>
748 748  
749 -AT+<CMD>         : Run <CMD>
871 +AT+<CMD>         :  Run <CMD>
750 750  
751 -AT+<CMD>=<value> : Set the value
873 +AT+<CMD>=<value> :  Set the value
752 752  
753 -AT+<CMD>=?  : Get the value
875 +AT+<CMD>=?  :  Get the value
754 754  
755 755  
756 756  (% style="color:#037691" %)**General Commands**(%%)      
757 757  
758 -AT  : Attention       
880 +AT  :  Attention       
759 759  
760 -AT?  : Short Help     
882 +AT?  :  Short Help     
761 761  
762 -ATZ  : MCU Reset    
884 +ATZ  :  MCU Reset    
763 763  
764 -AT+TDC  : Application Data Transmission Interval
886 +AT+TDC  :  Application Data Transmission Interval
765 765  
766 -AT+CFG  : Print all configurations
888 +AT+CFG  :  Print all configurations
767 767  
768 -AT+CFGMOD           : Working mode selection
890 +AT+CFGMOD           :  Working mode selection
769 769  
770 -AT+INTMOD            : Set the trigger interrupt mode
892 +AT+INTMOD            :  Set the trigger interrupt mode
771 771  
772 -AT+5VT  : Set extend the time of 5V power  
894 +AT+5VT  :  Set extend the time of 5V power  
773 773  
774 -AT+PRO  : Choose agreement
896 +AT+PRO  :  Choose agreement
775 775  
776 -AT+WEIGRE  : Get weight or set weight to 0
898 +AT+WEIGRE  :  Get weight or set weight to 0
777 777  
778 -AT+WEIGAP  : Get or Set the GapValue of weight
900 +AT+WEIGAP  :  Get or Set the GapValue of weight
779 779  
780 -AT+RXDL  : Extend the sending and receiving time
902 +AT+RXDL  :  Extend the sending and receiving time
781 781  
782 -AT+CNTFAC  : Get or set counting parameters
904 +AT+CNTFAC  :  Get or set counting parameters
783 783  
784 -AT+SERVADDR  : Server Address
906 +AT+SERVADDR  :  Server Address
785 785  
908 +AT+TR  :  Get or Set record time"
786 786  
910 +AT+APN     :  Get or set the APN
911 +
912 +AT+FBAND  :  Get or Set whether to automatically modify the frequency band
913 +
914 +AT+DNSCFG  : Get or Set DNS Server
915 +
916 +AT+GETSENSORVALUE   :  Returns the current sensor measurement
917 +
918 +AT+NOUD  :  Get or Set the number of data to be uploaded
919 +
920 +AT+CDP     :  Read or Clear cached data
921 +
922 +AT+LDDSALARM :  Get or Set alarm of distance
923 +
924 +
787 787  (% style="color:#037691" %)**COAP Management**      
788 788  
789 -AT+URI            : Resource parameters
927 +AT+URI            :  Resource parameters
790 790  
791 791  
792 792  (% style="color:#037691" %)**UDP Management**
793 793  
794 -AT+CFM          : Upload confirmation mode (only valid for UDP)
932 +AT+CFM          :  Upload confirmation mode (only valid for UDP)
795 795  
796 796  
797 797  (% style="color:#037691" %)**MQTT Management**
798 798  
799 -AT+CLIENT               : Get or Set MQTT client
937 +AT+CLIENT  :  Get or Set MQTT client
800 800  
801 -AT+UNAME  : Get or Set MQTT Username
939 +AT+UNAME  :  Get or Set MQTT Username
802 802  
803 -AT+PWD                  : Get or Set MQTT password
941 +AT+PWD  :  Get or Set MQTT password
804 804  
805 -AT+PUBTOPIC  : Get or Set MQTT publish topic
943 +AT+PUBTOPIC  :  Get or Set MQTT publish topic
806 806  
807 -AT+SUBTOPIC  : Get or Set MQTT subscription topic
945 +AT+SUBTOPIC  :  Get or Set MQTT subscription topic
808 808  
809 809  
810 810  (% style="color:#037691" %)**Information**          
811 811  
812 -AT+FDR  : Factory Data Reset
950 +AT+FDR  :  Factory Data Reset
813 813  
814 -AT+PWORD  : Serial Access Password
952 +AT+PWORD  :  Serial Access Password
815 815  
816 816  
817 817  
818 818  = ​5.  FAQ =
819 819  
958 +
820 820  == 5.1 ​ How to Upgrade Firmware ==
821 821  
822 822  
... ... @@ -836,6 +836,7 @@
836 836  
837 837  = 6.  Trouble Shooting =
838 838  
978 +
839 839  == 6.1  ​Connection problem when uploading firmware ==
840 840  
841 841  
... ... @@ -884,6 +884,7 @@
884 884  (((
885 885  
886 886  
1027 +
887 887  (% style="color:#037691" %)**Dimension and weight**:
888 888  
889 889  * Device Size: 13.0 x 5 x 4.5 cm
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