Wiki source code of Debug NB-IoT Connection
Last modified by David Huang on 2023/09/28 16:17
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| author | version | line-number | content |
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6.1 | 1 | = **For BC95-G** = |
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1.1 | 2 | |
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7.4 | 3 | ---- |
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7.1 | 4 | |
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7.4 | 5 | |
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7.2 | 6 | (% style="color:blue" %)**1. Check the reason why you can't access the network:** |
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1.1 | 7 | |
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7.6 | 8 | (% style="color:#037691" %)**1) AT+CEREG=5** |
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1.1 | 9 | |
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7.6 | 10 | (% style="color:#037691" %)**2) AT+CEREG?** (%%) ~/~/ This process may be longer, please repeat the input |
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1.1 | 11 | |
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7.7 | 12 | (% style="color:#037691" %)**3) Mainly check the two parameters **(% style="color:red" %)**cause_type and reject_case** |
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1.1 | 13 | |
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6.1 | 15 | [[image:image-20220530093747-3.png]] |
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1.1 | 16 | |
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6.1 | 17 | |
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7.2 | 18 | (% style="color:blue" %)**2. Network access operation:** |
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6.1 | 19 | |
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7.7 | 20 | (% style="color:#037691" %)**1) AT+CFUN=0** |
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1.1 | 21 | |
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7.7 | 22 | (% style="color:#037691" %)**2) AT+NBAND=X** (%%) ~/~/ X means the local frequency band number |
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1.1 | 23 | |
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7.7 | 24 | (% style="color:#037691" %)**3) AT+NRB** |
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1.1 | 25 | |
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7.7 | 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** |
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1.1 | 27 | |
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7.3 | 28 | |
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6.1 | 29 | [[image:image-20220530093821-4.png]] |
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1.1 | 30 | |
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7.2 | 32 | (% style="color:blue" %)**Remarks:** |
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6.1 | 33 | |
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7.7 | 34 | ~1. The operating voltage of the SIM card used must be less than 3.0V. |
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1.1 | 35 | |
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7.7 | 36 | 2. The network access time varies with the signal strength. |
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1.1 | 37 | |
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7.7 | 38 | 3. If you have not been able to access the network, please try to access the network manually. |
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8.1 | 39 | |
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9.1 | 41 | (% style="color:blue" %)**3. Check the PS Attach or Detach ** |
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8.1 | 42 | |
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9.1 | 43 | (% style="color:#037691" %)**1) AT+CGATT?** |
| 44 | |||
| 45 | (% style="color:#037691" %)**Response | ||
| 46 | +CGATT: <state> | ||
| 47 | OK** | ||
| 48 | |||
| 49 | (% style="color:#037691" %)**Write Command | ||
| 50 | AT+CGATT=<state>** | ||
| 51 | |||
| 52 | (% style="color:#037691" %)**<state> Integer type. Indicates the state of PS attachment. | ||
| 53 | 0 Detached | ||
| 54 | 1 Attached**(%%) | ||
| 55 | |||
| 56 | |||
| 57 | **Note:Generally, when registering with an operator, attaching GPRS is automatic, and CGATT can manually attach the network.** | ||
| 58 | |||
| 59 | |||
| 60 | (% style="color:blue" %)**4. Check the signaling connection status:** | ||
| 61 | |||
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8.1 | 62 | (% style="color:#037691" %)**1) AT+CSCON?** |
| 63 | |||
| 64 | (% style="color:#037691" %)**Response | ||
| 65 | +CSCON: <n>,<mode> | ||
| 66 | OK** | ||
| 67 | |||
| 68 | (% style="color:#037691" %)**<n> Enable/disable the URC. | ||
| 69 | 0 Disable the URC | ||
| 70 | 1 Enable URC +CSCON: <mode> | ||
| 71 | <mode>Signaling connection status. | ||
| 72 | 0 Idle | ||
| 73 | 1 Connected** | ||
| 74 | |||
| 75 | |||
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9.1 | 76 | (% style="color:blue" %)**5. Check the PDP Context Activate/Deactivate** |
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8.1 | 77 | |
| 78 | (% style="color:#037691" %)**1) AT+CGACT?** | ||
| 79 | |||
| 80 | (% style="color:#037691" %)**Response | ||
| 81 | [+CGACT: <cid>,<state>]** | ||
| 82 | |||
| 83 | (% style="color:#037691" %)**[+CGACT: <cid>,<state>] | ||
| 84 | […] | ||
| 85 | OK** | ||
| 86 | |||
| 87 | (% style="color:#037691" %)**<state> Integer type. The state of PDP context activation. | ||
| 88 | 0 Deactivated | ||
| 89 | 1 Activated | ||
| 90 | <cid> Integer type. A numeric parameter which specifies a particular PDP context definition (see | ||
| 91 | AT+CGDCONT).**(%%) | ||
| 92 | |||
| 93 | |||
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9.1 | 94 | **Note:Note that having a cell ID attached to the network does not necessarily mean successful activation. For data exchange, such as initiating HTTP requests, activation is necessary to use them.** |