Home Page Forums Raspberry Pi Shields Sixfab 3G,4G/LTE shield – GPS – +CME ERROR 504

This topic contains 4 replies, has 3 voices, and was last updated by  Saeed 3 months, 3 weeks ago.

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  • #35086

    Stanisław
    Participant

    Hello,

    I have your Sixfab 3G,4G/LTE shield and EC25 module. I followed your tutorial https://sixfab.com/gps-tracker-with-3g-4glte-shield/ and I have problem. When I write down AT+QGPS=1 in minicom I get “+CME error: 504”. Do you know why? Besides I don’t see what I typing in minicom (like typing of a password).

    I work on Raspberry Pi 3, Ubuntu Mate.

    Thanks in advance for any clue

    Best Regards
    Stanisław

    #35172

    Saeed
    Moderator

    Hi Stainslaw,

    Could you please try with other port. CME error 504 means a session is ongoing. Could you please check from other port?

    #40137

    tom-sixfab
    Participant

    Which other ports should be tested. I am also having similar problems now (it was working before). The USB2 device is interacting properly, but I get the 504 error when I attempt to activate the feed. If I issue
    AT+QGPS=0
    I get this
    +CME ERROR: 501

    #40143

    tom-sixfab
    Participant

    The behavior is inconsistent, but it seems happier after a full (power off) shutdown. I was also able to get control back by issuing the command ‘AT+QGPSEND’.

    #40186

    Saeed
    Moderator

    Yes,
    AT+QGPS=0 is not a valid command.

    You should rather use AT+QGPSEND.

    Please check the GNSS AT command manual.

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