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Portenta H7 with Cat. M1/NB shield does not connect over LTE Cat-M1 | Thales IoT Developer Community

June 30, 2022 - 1:40pm, 223 views

While working with the Arduino Portenta H7 Cat. M1/NB shield, I found out that the Thales Cinterion TX62 cellular modem only connects over NB-IoT, NOT over LTE Cat-M1.

I'm using th Arduino Portenta library, with the below code snippet:

#include <GSM.h>

char pin[]      = SECRET_PIN;       //example "1234"
char apn[]      = SECRET_APN;       //example "live.provider.com"
char username[] = SECRET_USERNAME;
char pass[]     = SECRET_PASSWORD;

void setup() {
  Serial.begin(115200);
  while(!Serial) {}
  GSM.debug(Serial);

    if(GSM.begin(pin, apn, username, pass, CATM1)){
        Serial.println("connected");
    }
}

I defined the use of CATM1 in the GSM.begin(), but it doesn't connect and eventually moves to NB-IoT after a few tries, as shown in the logs:

AT^SXRAT=7
+CME ERROR: unknown
AT error code 0
CellularContext connect
Setup SIM (timeout 10000 ms)
...
+CEREG: 2<cr><ln><cr><ln>+CEREG: 5,"2D5B","0187FB66",9

 

Any pointers on how to make the shield connect over LTE CAT-M1?

I haven't managed to directly communicate with the cellular modem yet, allowing me to send AT Commands to the board directly. Any support to make this work would also be appreciated.

 

Thanks,
Laurens