FiPy with NB-IoT sim cards but no signal
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Have you actually tried the NB-IoT example in the docs?
The output you have provided doesn't really help at this point because I don't see the radio being enabled.
The LTE class documentation also has more details about commands to use for troubleshooting.
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@Xykon
Thanks for replying.
Yes, I have tried the example but every time I try the lte.isattached() step, I would always get "False" and I could not know what happened.
Could you please give me some directions on how to enable the radio? -
@WalkerYun If I use your script with my FiPy, I get the same results. However, the device connects fine to LTE NBIoT, using the test script @Xykon pointed at. I had a case yesterday that all by sudden the modem refused to connect. Re-Flashing the modem firmware in recovery mode solved the issue. Never happened before. Could you please try the following commands:
from network import LTE lte=LTE() print(lte.send_at_cmd('AT!="showver"')) print(lte.send_at_cmd('AT!="setDbgPerm full"')) print(lte.send_at_cmd('AT!="showCaps"'))That shows the firmware version and the supported bans of the modem. Please check also the version of your FiPy. The number is at the bottom side of the module next to the SIM card. It should be r1.2. r1.0 Versions have issues and must be replaced.
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@robert-hh
Thanks for replying. I've tried the script of you and it returned 1 in both nb-iot and cat-m1.
I have checked the version of Fipy and discovered that it is V1.0r. However, what kind of issue would happen if I use V1.0r? Could it connect to LTE CAT-M1? -
@WalkerYun It is more intersting which EUTRA band are supported, like in my result:
>>> from network import LTE >>> lte=LTE() >>> print(lte.send_at_cmd('AT!="showver"')) SYSTEM VERSION ============== FIRMWARE VERSION Bootloader0 : 5.1.1.0 [39529] Bootloader1* : 6.0.0.0 [41019] Bootloader2 : 6.0.0.0 [41019] NV Info : 1.1,0,0 Software : 6.0.0.0 [41019] by robot-soft at 2018-12-13 21:41:15 UE : 6.0.0.0 COMPONENTS ZSP0 : 1.0.99-3171 ZSP1 : 1.0.98-3170 OK >>> print(lte.send_at_cmd('AT!="setDbgPerm full"')) OK >>> print(lte.send_at_cmd('AT!="showCaps"')) == CAPS config ============================= .Lock UE on SRV band : false .MFBI support : true .TM8 TDD support : false ============================================ == CAPS ==================================== . access stratum: R13 . catM : 1 . nb-IoT : 1 -- EUTRA bands -- . supported : 66/28/26/25/20/19/18/17/14/13/12/8/5/4/3/2/1 . board : 1/2/3/4/5/8/12/13/14/17/18/19/20/25/26/28/66 . admin : . pending admin : -- EUTRA carriers -- . admin : . pending admin : ============================================ OKVersion 1.0r supports only a small setg of EUTRA bands, and if your provider uses these, than the device will not work.
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I am facing the same issue. I am in Japan and using Fipy 1.0r with Hologram sim.
The sim works with phone.
How can I know if the supported band work here? @robert-hh, what do you mean by "It should be r1.2. r1.0 Versions have issues and must be replaced." You mean I need to buy a new one or I can ask Pycom to replace it?>>> print(lte.send_at_cmd('AT!="showver"')) SYSTEM VERSION ============== FIRMWARE VERSION Bootloader0 : 5.1.1.0 [33080] Bootloader1* : 5.1.1.0 [38638] Bootloader2 : 5.1.1.0 [39529] NV Info : 1.1,0,0 Software : 5.1.1.0 [39529] by robot-soft at 2018-09-28 16:07:40 UE : 5.0.0.0d COMPONENTS ZSP0 : 1.0.99-13616 ZSP1 : 1.0.99-12355 OK >>> print(lte.send_at_cmd('AT!="setDbgPerm full"')) OK >>> print(lte.send_at_cmd('AT!="showCaps"')) == CAPS config ============================= .Lock UE on SRV band : false .MFBI support : true .TM8 TDD support : false ============================================ == CAPS ==================================== . access stratum: R13 . catM : 1 . nb-IoT : 0 -- EUTRA bands -- . supported : 28/20/13/12/4/3 . board : 3/4/12/13/20/28 . admin : . pending admin : -- EUTRA carriers -- . admin : . pending admin : ============================================ OK -
@naveen your post shows an old modem firmware. You should update that as a first step.
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@naveen Looking for the LTE bands used in Japan, it is not likely that a r1.0 device matches. Pycom has a replacement program for these devices. Look at the following link on how to use it. https://forum.pycom.io/topic/3843/important-news-regarding-cat-m1-and-nb-iot-cellular-range.
You need a little patience, because Pycom seems very busy at the moment. Buying a new one, if not from Pycom, may not get you a r1.2 model. Vendors may still have r1.0 devices on stock and sell them in good faith. -
@robert-hh I have updated the firmware. It shows more bands now but still not attaching to the network.
SYSTEM VERSION ============== FIRMWARE VERSION Bootloader0 : 5.1.1.0 [41065] Bootloader1* : 5.1.1.0 [41065] Bootloader2 : 5.1.1.0 [41065] NV Info : 1.1,0,0 Software : 5.1.1.0 [41065] by robot-soft at 2018-12-17 13:03:40 UE : 5.0.0.0d COMPONENTS ZSP0 : 1.0.99-13616 ZSP1 : 1.0.99-12376 == CAPS config ============================= .Lock UE on SRV band : false .MFBI support : true .TM8 TDD support : false ============================================ == CAPS ==================================== . access stratum: R13 . catM : 1 . nb-IoT : 0 -- EUTRA bands -- . supported : 66/28/26/25/20/19/18/17/14/13/12/8/5/4/3/2/1 . board : 1/2/3/4/5/8/12/13/14/17/18/19/20/25/26/28/66 . admin : . pending admin : -- EUTRA carriers -- . admin : . pending admin : ============================================Output:
modem command: AT+CEREG=2 response=['OK'] modem command: AT+CFUN=1 response=['OK'] modem command: AT+CGDCONT=1,"IP","hologram" response=[] attempt to attach cell modem to base station... modem command: ATI response=['+SYSSTART'] modem command: AT+SQNCCID? response=['+SQNCCID: "",""', 'OK'] modem command: AT+CEREG? response=['+CEREG: 2,0', 'OK'] tac=0 modem command: AT+CSQ response=['+CSQ: 99,99', 'OK'] modem command: AT+CEER response=['+CEER: lastEmmCause: NO CAUSE RECEIVED, lastEsmCause: NO CAUSE RECEIVED', 'OK'] -
@naveen That was the case for my r1.0 boards too. I had to replace them by r1.2 boards.
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@robert-hh Thanks for your response. Did they send new board or fixed the same one. How long it took to send and get it back? And what was the shipping cost?
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@naveen They have sent new boards, and it took ~4 weeks. But at that time they were still searching for the best fix.
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@robert-hh @Xykon It took over a month and finally I received a new FiPy r1.2 board. I have tested the CAT-M1 firmware on this board using hologram sim and it was able to connect and send message using Softbank japan CAT-M1 LTE network.
But when I upgraded the firmware with NB-IOT (41019), it is not attaching to any network. The Softbank supports CAT-M1 and NB-IOT both. I am in a good coverage area and it took just 2-3 seconds to attach the CAT-M1 network. What could be the reason? -
@naveen That sounds not good. A few questions:
- which firmware for the FiPy are you using?
- how long did you wait for the attach?
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@robert-hh I am using the latest stable v1.18.2.r7 (just updated few hours ago). I waited a minute or so.
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@naveen I never tried that with the master branch before. I always used the release-candidate branch. But I loaded now the firmware 1.18.2.r7 from the web site and it works too. As far as I remember, the first attach took like 15 minutes. After that, it is down now to ~10 seconds.
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@robert-hh I waited for 25 minutes but still it is not attaching to NB-IOT network. I reverted the firmware to CATM1 again and it works flawlessly. How can I debug the issue?
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@naveen No clue. When it did not work for me, I could not get a hand on debugging. I only purchased another LTE NBIoT module to verify, that the service was available and the SIM worked. It did. Module type SIM7020.
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