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nRF9160-DK , Modem_shell demo , ppp unable to access the Internet

JackyChen

Hello,guys

I build nrf9160-dk modem_shell demo as cmd '$ west build -b nrf9160dk_nrf9160ns ' and then '$ west flash ', after the system running up, I try to ping baidu website，it works as follow picture.

And then I rebuild the Modem_shell demo with cmd ' $ west build -p -b nrf9160dk_nrf9160_ns -d build -- -DOVERLAY_CONFIG=overlay-ppp.conf' for supporting ppp function. After the system running up, I try to ping baidu website again，it works as follow picture and it work failed.

I can capture any data from another serial, I guess VCOM0 serial is shell and VCOM2 serial is ppp channel.

To test my guess，I plugged nrf9160-DK board into my Ubuntu virtual machine and disable Ubuntu network. Use minicom tool to connect VCOM0 and open nrf9160-DK shell in A terminal, set the custom configuration for PPP uart with cmd 'ppp uartconf -b 115200' . New B terminal for ppp connection , type cmd ' $sudo pppd -detach /dev/ttyACM2 115200 DK-ip:Ubuntu-ip noauth nocrtscts local ' , then A terminal return "Dial up connection up" . New C terminal and type cmd ' ifconfig ' , I can see ppp0 and it's ip ,I try to ping baidu website,it work as follow picture.

it can't access the Internet ? why ? Did I operate wrong? Please point out my mistakes.

The version of modem_fw I use is 1.3.0 , ncs version is 1.7.0.

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  • 0 in reply to Håkon Alseth

    Hi,

    em.....

    I don't know how to set using NB1 when test mqtt_simple. I didn't see any introduction in https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/samples/nrf9160/mqtt_simple/README.html#building-and-running .

    When I program the mqtt_simple to my DK board, the uart output log is:

    SPM: NS MSP at 0x20019b70
    SPM: NS reset vector at 0x13d6d
    SPM: prepare to jump to Non-Secure image.
    *** Booting Zephyr OS build v2.6.99-ncs1-10-g7b6343a709b5 ***
    [00:00:00.207,244] <wrn> at_notif: Already initialized. Nothing to do
    [00:00:00.207,336] <inf> mqtt_simple: The MQTT simple sample started
    [00:00:00.207,336] <inf> mqtt_simple: Disabling PSM and eDRX
    [00:00:00.208,251] <inf> mqtt_simple: LTE Link Connecting...
    +CEREG: 4
    +CEREG: 0
    [00:10:00.257,141] <inf> lte_lc: Network connection attempt timed out
    [00:10:00.280,792] <inf> lte_lc: Using fallback network mode
    +CEREG: 2,"1D26","0AC23D3E",9
    +CSCON: 1
    +CEREG: 1,"1D26","0AC23D3E",9,,,"11100000","11100000"
    [00:10:10.128,234] <inf> mqtt_simple: LTE Link Connected!
    [00:10:10.128,479] <err> mqtt_simple: getaddrinfo failed: -2
    [00:10:10.128,479] <err> mqtt_simple: Failed to initialize broker connection
    [00:10:10.128,479] <err> mqtt_simple: client_init: -10
    +CSCON: 0
    +CEREG: 1,"1D28","0D1E5A42",9,,,"11100000","11100000"
    +CSCON: 1
    +CSCON: 0
    +CEREG: 1,"1D26","0AC23D3E",9,,,"11100000","11100000"
    +CEREG: 1,"1D28","0D1E5A42",9,,,"11100000","11100000"
    +CEREG: 1,"1D26","0AC23D3E",9,,,"11100000","11100000"
    +CEREG: 1,"1D28","0D1E5A41",9,,,"11100000","11100000"
    +CEREG: 1,"1D26","0AC23D3E",9,,,"11100000","11100000"

    It looks like I can't get an IP address.

  • 0 in reply to JackyChen

    Hi,

     

    You need to contact your network provider and ask what is supported in their network. I also see that you are not getting PSM from the network, and you're in total connected to three different cell towers in your log.

    Which provider are you connecting to?

     

    Kind regards,

    Håkon

  • 0 in reply to Håkon Alseth

    I use China-Mobile SIM card which is dedicated for IOT,  their technical support said that IP and DNS are obtained at the same time.

    I plug the SIM card into my phone , my phone can surf the Internet with this SIM card.

    So, I'm not sure if there's a compatibility problem with the way to gets DNS?

  • 0 in reply to Håkon Alseth

    Hi,Håkon

    Could you push your model_shell firmware and modem-firmware here, I can dowanload them for test on my side.

    Thanks.

    JackeyChen

  • 0 in reply to JackyChen

    Hi,

     

    JackyChen said:
    Could you push your model_shell firmware and modem-firmware here, I can dowanload them for test on my side.

    This will not help, as the issues you're seeing is network related, not firmware related.

     

    JackyChen said:

    I use China-Mobile SIM card which is dedicated for IOT,  their technical support said that IP and DNS are obtained at the same time.

    I plug the SIM card into my phone , my phone can surf the Internet with this SIM card.

    So, I'm not sure if there's a compatibility problem with the way to gets DNS?

    Could you please try to run "at_client" sample on your nRF9160?

    This should be used in combination with LTE Link Monitor (available inside nRF Connect for Desktop), which enables network related error codes.

     

    What you should issue of commands in there to enable NB1 and start the network connection:

    AT+CEREG=5
AT%XSYSTEMMODE=0,1,0,0
AT+CFUN=1
AT+CFUN?

     

    Could you then let it log for some minutes and share the log with me?

     

    Kind regards,

    Håkon

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