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  • Case ID: 353698
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UDP server NRF9151 using Hologram

Deval

Hello,

I am using the example on the Nordic DK to get UDP messages from the Hologram API to the Nordic Modem. 

AT#XUDPSVR=1,6002
#XUDPSVR: 3,"started"

OK

I very inconsistently get messages (if ever). 

I am not changing any of the standard operation of the modem. I am running the AT Command with CMUX and PPPd overlay. I am successfully able to connect to the network and run a pppd connnection, but when I start the UDP server I never get messages.

Is there some additional configuration required? 

I am following this guide: https://docs.nordicsemi.com/bundle/ncs-2.6.0/page/nrf/applications/serial_lte_modem/doc/slm_testing.html#generic_at_commands

Specifically this part "Test the UDP server with UDP proxy service:"

I know this service works on Hologram because we use it with a different modem. 

I know I have a connection to the network because this is my output from CEREG

+CEREG: 3,5,"8309","04C8B910",7

I know my APN is set correctly

AT+CGDCONT?
+CGDCONT: 0,"IP","hologram","10.90.66.67",0,0

So what is going wrong? Do I need to anything additional? I am not changing any power states. I have seen inconsistent results with SMS as well (and TCP has never worked). 

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  • 0

    Hi,

    Have you tried to test UDP connection using python script as shown in UDP server (points 1 and 2)?

    Best regards,
    Dejan

  • 0 in reply to dejans

    So I don't have a public IP address so I cannot use the python script. But I know the service that Hologram provides will let you send a UDP message to their SIMs since it uses their internal API and I see confirmation that the message was sent. 

    And I have seen it work with this cell modem with the Hologram SIM it is just very inconsistent. 

    For example when it worked:

    #XUDPDATA: 24,"10.254.0.75",15694
    how long does this take?
    #XUDPDATA: 9,"10.254.0.75",20100
    try again

    I can see that I have a private IP

    AT+CGDCONT?
    +CGDCONT: 0,"IP","hologram","10.90.66.67",0,0

    OK

    So I know the service does work. 

    Additionally, I am seeing low (or undefined signal quality), but a successful PPP connection. Is it possible causing the issue? Because I am seeing inconsistent results from SMS as well.

    AT+CSQ
    +CSQ: 99,99

    OK
    AT+CESQ
    +CESQ: 99,99,255,255,255,255

    OK

Reply
  • 0 in reply to dejans

    So I don't have a public IP address so I cannot use the python script. But I know the service that Hologram provides will let you send a UDP message to their SIMs since it uses their internal API and I see confirmation that the message was sent. 

    And I have seen it work with this cell modem with the Hologram SIM it is just very inconsistent. 

    For example when it worked:

    #XUDPDATA: 24,"10.254.0.75",15694
    how long does this take?
    #XUDPDATA: 9,"10.254.0.75",20100
    try again

    I can see that I have a private IP

    AT+CGDCONT?
    +CGDCONT: 0,"IP","hologram","10.90.66.67",0,0

    OK

    So I know the service does work. 

    Additionally, I am seeing low (or undefined signal quality), but a successful PPP connection. Is it possible causing the issue? Because I am seeing inconsistent results from SMS as well.

    AT+CSQ
    +CSQ: 99,99

    OK
    AT+CESQ
    +CESQ: 99,99,255,255,255,255

    OK

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