added `CNMI` command to init function

Seeed-Studio / GPRS_SIM900

library for GPRS shield with sim900 module.

MIT License

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added `CNMI` command to init function #52

Closed jagjordi closed 4 years ago

jagjordi commented 4 years ago

I had problems when using the CMGL command and it wouldn't reply with any message in the buffer, adding the CNMI configuration in the init solved the issue for me