1. Home
  2. The Thing For IoT Creators
  3. Quectel BC66, UDP, T-Mobile SIM in Germany: DNS parse failed

Quectel BC66, UDP, T-Mobile SIM in Germany: DNS parse failed

  • Roalnd Baldin
    Deutsche Telekom IoT

    Hi,

    unfortunatelly I can not connect to UDP server of T-Mobile Netherlands šŸ˜ž

    In the following the key infos about my scenario:

    • I am using the Quectel BC66-TE-B development kit
    • I am working with a IoT sim card from T-Mobile Netherland in Germany.
    • The roaming for Germany is activated for the sim card.
    • The APN is set to: cdp.iot.t-mobile.nl
    • The device get assigned the IP address : 10.0.0.191
    • The command: AT+QIOPEN=1,0,ā€œUDPā€, ā€œ172.27.131.100ā€,15683,1001,1,1
    • As the result I got the error response: +QIOPEN: 1,565
    • The code 565 means: DNS parse failed

    I tryed to execute AT+QIOPEN for IPv4 and IPv6. In both cases I got the same problem.

    Actually I think that the IP 10.0.0.191 looks very very strange.

    I can setup the IP address of the DNS server explicity. Does anyone know it??

    Many thanks for your help!

    Regards, Roland

    0
  • Roalnd Baldin
    Deutsche Telekom IoT

    ā€¦ Now I got a diffrent IP 10.128.1.149. Still the same problem šŸ˜ž

    0
  • S

    Hi, can you give us the full sequence of commands you use? That will help us find what is wrong.

    1
  • Roalnd Baldin
    Deutsche Telekom IoT

    Deactivate auto sleep mode

    AT+QSCLK=0

    Persistent setup

    Set the band to band 8 (900 MHz) for Deutsche Telekom NB-IoT

    AT+QBAND=1,8

    Turn off the radio.

    AT+CFUN=0

    Set the APN

    AT*MCGDEFCONT="IP","cdp.iot.t-mobile.nl"

    Restart the module as some configurations only take place after a reboot.

    AT+QRST=1

    After reboot automatic dial-in to the network

    F1: 0000 0000
V0: 0000 0000 [0001]
00: 0006 000C
01: 0000 0000
U0: 0000 0001 [0000]
T0: 0000 00B4
Leaving the BROM

AT+QSCLK=0
OK

+IP: 10.128.1.137

    Open UDP socket and send message

    Open the UDP socket to server

    AT+QIOPEN=1,1,"UDP", "172.27.131.100",15683,1001,0,0
OK

+QIOPEN: 1,565

    Get the last error with description

    AT+QIGETERROR
+QIGETERROR: 565,dns parse failed

OK

    The return from AT+QIOPEN should be +QIOPEN: 1,0

    Many many thanks for your help!

    Regards, Roland

    0 S 1 Reply
  • S

    Hi, I am trying to reproduce this but my BC66 modem doesnā€™t even recognize the +QIOPEN command. So I am updating the FW first.

    @Roalnd-Baldin said in Quectel BC66, UDP, T-Mobile SIM in Germany: DNS parse failed:

    AT+QIOPEN=1,1,"UDP", "172.27.131.100",15683,1001,0,0
OK

+QIOPEN: 1,565

    I notice you have a whitespace between ā€˜,ā€™ and ā€œ172.27.131.100ā€. I canā€™t verify but I know some modems donā€™t like this and will fail.

    1
  • Roalnd Baldin
    Deutsche Telekom IoT

    Hi Stefan,

    you are a cool guy!! This solved the problem. It was the whitespace.

    Many many thanks for your support!!

    Regards, Roland

    2
  • Roalnd Baldin
    Deutsche Telekom IoT

    Hi Stefan,

    again many thanks. It works now. I can send data to my App. The following sequence works for Quectel BC66:

    Deactivate auto sleep mode

    AT+QSCLK=0

    Persistent network and APN setup

    AT+QBAND=1,8
AT+CFUN=0
AT*MCGDEFCONT="IP","cdp.iot.t-mobile.nl"

    Restart the module as some configurations only take place after a reboot.

    AT+QRST=1

    After reboot wakup from sleep, deactivate auto sleep mode again and wait for network connect

    AT+QSCLK=0

+IP: 10.128.0.134

    Create a UDP socket and for UDP server

    AT+QIOPEN=1,1,"UDP","172.27.131.100",15683,1001,0,0

    Send message ā€œHello Worldā€

    AT+QISEND=1,11,48656c6c6f20576f726c64
    2 S 1 Reply
  • S

    @Roalnd-Baldin Cool! Nice to see it works now.

    0
nb-iot 92 connection 14
Log in to reply