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botletics / SIM7000-LTE-Shield

Botletics SIM7000 LTE CAT-M1/NB-IoT Shield for Arduino
https://www.botletics.com/products/sim7000-shield
GNU General Public License v3.0
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force LTE NB-IoT, needs enableGPRS? #102

Closed tomtobback closed 4 years ago

tomtobback commented 5 years ago

Hi, i live in Hong Kong and i'm trying to make my SIM7000C work with LTE and your modified FONA library. It defaults to 2G and GPRS works fine (so far tried 2 operators, CSL and China Mobile). These SIM cards also support 4G, and operators claim they have NB-IoT deployed, so i'm trying to force the SIM7000C to use LTE with setPreferredMode(38). I use setNetworkSettings with the APN, but do i still need to enable GPRS if i want to use LTE? When i do that, my module hangs after 'AT+CGATT=1'. In the library .cpp file at enableGPRS() there are some comments 'uncomment for LTE only' but it seems they don't apply for the SIM7000.

botletics commented 5 years ago

The lines that say "uncomment for LTE only" are applicable to the SIM7000 so you could try doing that. However, please first check if you are even connected to a network to begin with using the "n" and "1" commands in the LTE_Demo sketch

mcejp commented 5 years ago

I had to uncommend the LTE-only part and force mode 38 to get any GPRS at all (Lebara, the Netherlands; SIM7000E). Otherwise I was getting stuck at either AT+CGATT or AT+CSTT

And at one point it also turned out that my battery wasn't supplying enough power, so be sure to check that out.