Wiki source code of Debug NB-IoT Connection
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| author | version | line-number | content |
|---|---|---|---|
| 1 | = **For BC95-G** = | ||
| 2 | |||
| 3 | ---- | ||
| 4 | |||
| 5 | |||
| 6 | (% style="color:blue" %)**1. Check the reason why you can't access the network:** | ||
| 7 | |||
| 8 | (% style="color:#037691" %)**1) AT+CEREG=5** | ||
| 9 | |||
| 10 | (% style="color:#037691" %)**2) AT+CEREG?** (%%) ~/~/ This process may be longer, please repeat the input | ||
| 11 | |||
| 12 | (% style="color:#037691" %)**3) Mainly check the two parameters **(% style="color:red" %)**cause_type and reject_case** | ||
| 13 | |||
| 14 | |||
| 15 | [[image:image-20220530093747-3.png]] | ||
| 16 | |||
| 17 | |||
| 18 | (% style="color:blue" %)**2. Network access operation:** | ||
| 19 | |||
| 20 | (% style="color:#037691" %)**1) AT+CFUN=0** | ||
| 21 | |||
| 22 | (% style="color:#037691" %)**2) AT+NBAND=X** (%%) ~/~/ X means the local frequency band number | ||
| 23 | |||
| 24 | (% style="color:#037691" %)**3) AT+NRB** | ||
| 25 | |||
| 26 | (% style="color:#037691" %)**4) After waiting for a period of time, you can use **(% style="color:red" %)**AT+CSQ **(%%)**to query the network access** | ||
| 27 | |||
| 28 | |||
| 29 | [[image:image-20220530093821-4.png]] | ||
| 30 | |||
| 31 | |||
| 32 | (% style="color:blue" %)**Remarks:** | ||
| 33 | |||
| 34 | ~1. The operating voltage of the SIM card used must be less than 3.0V. | ||
| 35 | |||
| 36 | 2. The network access time varies with the signal strength. | ||
| 37 | |||
| 38 | 3. If you have not been able to access the network, please try to access the network manually. |