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Last modified by Mengting Qiu on 2025/07/03 18:55
From version 131.1
edited by Edwin Chen
on 2024/02/07 00:21
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To version 145.1
edited by Edwin Chen
on 2024/02/29 23:34
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22 22  To attache NB-IoT sensors to NB-IoT Network, You need to:
23 23  
24 24  1. Get a NB-IoT SIM card from Service Provider. (Not the same as the SIM card we use in mobile phone)
25 -1. Insert the SIM card to Sensor
25 +1. Power Off End Node ( See below for the power off/on position)
26 +1. Insert the SIM card to Sensor. ( See below for direction)
27 +1. Power On End Node
26 26  1. [[Configure APN>>http://wiki.dragino.com/xwiki/bin/view/Main/How%20to%20configure%20APN%20in%20the%20node/]] in the sensor (AT+APN=<APN>)
27 27  
30 +[[image:image-20240208102804-1.png||height="286" width="696"]]
31 +
28 28  [[image:image-20230808205045-1.png||height="293" width="438"]]
29 29  
30 30  After doing above, the NB-IoT Sensors should be able to attach to NB-IoT network .
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44 44  == 2.2 Speed Up Network Attach time ==
45 45  
46 46  
47 -BC660K-GL supports multi bands (% style="color:blue" %)**B1/B2/B3/B4/B5/B8/B12/B13/B14/B17/B18/B19/B20/B25/B28/B66/B70/B85. **(%%) It will search one by one and try to attach, this will take a lot of time and even cause attach fail. User can lock the band to specify band for its operator to make this faster.
51 +BC660K-GL supports multi bands (% style="color:blue" %)**B1/B2/B3/B4/B5/B8/B12/B13/B14/B17/B18/B19/B20/B25/B28/B66/B70/B85. **(%%) It will search one by one and try to attach, this will take a lot of time and even cause attach fail and show Signal Strenght:99. User can lock the band to specify band for its operator to make this faster.
48 48  
49 49  (% style="color:#037691" %)**AT+QBAND?       **(%%) ~/~/ Check what is the current used frequency band
50 50  
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90 90  
91 91  * (% style="color:#037691" %)**AT+SERVADDR=120.24.4.116,5601**  (%%) ~/~/  Set UDP server address and port
92 92  
93 -* (% style="color:#037691" %)**AT+CFM=1**    (%%) ~/~/  If the server does not respond, this command is unnecessary
94 -
95 95  [[image:image-20230802112413-2.png]]
96 96  
97 97  
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621 621  (% style="color:blue" %)**See result in TCP Server:**
622 622  
623 623  [[image:image-20230807233631-2.png]]
626 +
627 +
628 += 4. FAQ =
629 +
630 +== 4.1 What is the usage of Multi Sampling and One Uplink? ==
631 +
632 +The NB series has the feature for Multi Sampling and one uplink. See one of them
633 +
634 +[[http:~~/~~/wiki.dragino.com/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/SN50v3-NB_BN-IoT_Sensor_Node_User_Manual/#H2.5Multi-SamplingsandOneuplink>>http://wiki.dragino.com/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/SN50v3-NB_BN-IoT_Sensor_Node_User_Manual/#H2.5Multi-SamplingsandOneuplink]]
635 +
636 +User can use this feature for below purpose:
637 +
638 +1. **Reduce power consumption**. The NB-IoT transmit power is much more higher than the sensor sampling power. To save battery life, we can sampling often and send in one uplink.
639 +1. Give more sampling data points.
640 +1. Increase reliable in transmission. For example. If user set
641 +1*. **AT+TR=1800** ~/~/ The unit is seconds, and the default is to record data once every 1800 seconds (30 minutes, the minimum can be set to 180 seconds)
642 +1*. **AT+NOUD=24** ~/~/  The device uploads 24 sets of recorded data by default. Up to 32 sets of record data can be uploaded.
643 +1*. **AT+TDC=7200**  ~/~/ Uplink every 2 hours.
644 +1*. this will mean each uplink will actually include the 6 uplink data (24 set data which cover 12 hours). So if device doesn;t lost 6 continue data. There will not data lost.
645 +
646 +
647 +== 4.2 Why the uplink JSON format is not standard? ==
648 +
649 +The json format in uplink packet is not standard Json format. Below is the example. This is to make the payload as short as possible, due to NB-IoT transmit limition, a standard Json is not able to include 32 sets of sensors data with timestamp.
650 +
651 +[[image:image-20240229233154-1.png]]
652 +
653 +
654 +
655 += 5. Trouble Shooting: =
656 +
657 +== 5.1 Checklist for debuging Network Connection issue. Signal Strenght:99 issue. ==
658 +
659 +There are many different providers provide NB-IoT service in the world. They might use different band, different APN & different operator configuration. Which makes connection to NB-IoT network is complicate.
660 +
661 +If end device successfully attached NB-IoT Network, User can normally see the signal strengh as below (between 0~~31)
662 +
663 +[[image:image-20240207002003-1.png]]
664 +
665 +
666 +If fail to attach network, it will shows signal 99. as below:
667 +
668 +[[image:image-20240207002129-2.png]]
669 +
670 +
671 +(% class="lead" %)
672 +When see this issue, below are the checklist:
673 +
674 +* Does your SIM card support NB-IoT network? If SIM card doesn't not specify support NB-IoT clearly, normally it doesn't support. You need to confirm with your operator.
675 +* Do you configure the correct APN? [[Check here for APN settings>>http://wiki.dragino.com/xwiki/bin/view/Main/General%20Configure%20to%20Connect%20to%20IoT%20server%20for%20-NB%20%26%20-NS%20NB-IoT%20models/#H2.1GeneralConfiguretoattachnetwork]].
676 +* Do you lock the frequency band? This is the most case we see. [[Explain and Instruction>>http://wiki.dragino.com/xwiki/bin/view/Main/General%20Configure%20to%20Connect%20to%20IoT%20server%20for%20-NB%20%26%20-NS%20NB-IoT%20models/#H2.2SpeedUpNetworkAttachtime]].
677 +* Check if the device is attached to Carrier network but reject. (need to check with operator).
678 +* Check if the antenna is connected firmly.
679 +
680 +If you have check all above and still fail. please send console log files (as many as possible) to [[support@dragino.com>>mailto:support@dragino.com]] so we can check.
681 +
682 +
683 +== 5.2 Issue: "NBIOT did not respond" ==
684 +
685 +(% class="box errormessage" %)
686 +(((
687 +11:24:22.397 [44596]NBIOT did not respond.
688 +11:24:24.315 [46530]NBIOT did not respond.
689 +11:24:26.256 [48464]NBIOT did not respond.
690 +11:24:28.196 [50398]NBIOT did not respond.
691 +11:24:30.115 [52332]NBIOT did not respond.
692 +11:24:32.127 [54266]NBIOT did not respond.
693 +11:24:32.127 [54299]Restart the module...
694 +11:24:39.181 [61332]No response when shutting down
695 +)))
696 +
697 +This issue might due to initiate issue for NB-IoT module. In this case, please try:
698 +
699 +1) Open Enclosure
700 +
701 +2) Power off device by pull out the power on Jumper
702 +
703 +3) Power on device by connect back the power jumper.
704 +
705 +4) push reset button.
706 +
707 +[[image:image-20240208001740-1.png]]
708 +
709 +
710 +== 5.3 Issue: "Failed to readI MSI number" ==
711 +
712 +(% class="box errormessage" %)
713 +(((
714 +[18170]Failed to read IMSI:1umber.
715 +[20109]Failed to read IMSI numoer.
716 +[22048]Failed to read IMSI number.
717 +[29842lRestart the module...
718 +)))
719 +
720 +Make sure that the SIM card is insert in correct direction and device is power off/on during insert. Here is reference link: [[Insert SIM Card>>||anchor="H2.1GeneralConfiguretoattachnetwork"]].
721 +
722 +
723 +== 5.4 Why sometime the AT Command is slow in reponse? ==
724 +
725 +When the MCU is communicating with the NB-IoT module, the MCU response of AT Command will become slower, it might takes several seconds to response.
726 +
727 +[[image:image-20240226111928-1.png]]
728 +
729 +
730 +
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