Wiki source code of Debug NB-IoT Connection
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| author | version | line-number | content |
|---|---|---|---|
| 1 | = **For BC95-G** = | ||
| 2 | |||
| 3 | **~1. Check the reason why you can't access the network:** | ||
| 4 | |||
| 5 | 1) AT+CEREG=5 | ||
| 6 | |||
| 7 | 2) AT+CEREG? ~/~/This process may be longer, please repeat the input | ||
| 8 | |||
| 9 | 3) Mainly check the two parameters cause_type and reject_case | ||
| 10 | |||
| 11 | |||
| 12 | [[image:image-20220530093747-3.png]] | ||
| 13 | |||
| 14 | |||
| 15 | **2. Network access operation:** | ||
| 16 | |||
| 17 | 1) AT+CFUN=0 | ||
| 18 | |||
| 19 | 2) AT+NBAND=X ~/~/X means the local frequency band number | ||
| 20 | |||
| 21 | 3) AT+NRB | ||
| 22 | |||
| 23 | 4) After waiting for a period of time, you can use AT+CSQ to query the network access | ||
| 24 | |||
| 25 | [[image:image-20220530093821-4.png]] | ||
| 26 | |||
| 27 | |||
| 28 | **Remarks:** | ||
| 29 | |||
| 30 | ~1. The operating voltage of the SIM card used must be less than 3.0V | ||
| 31 | |||
| 32 | 2. The network access time varies with the signal strength | ||
| 33 | |||
| 34 | 3. If you have not been able to access the network, please try to access the network manually |