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 |
---|---|---|---|
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. | ||
39 | |||
40 | |||
41 | (% style="color:blue" %)**3. Check the PS Attach or Detach ** | ||
42 | |||
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 | |||
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 | |||
76 | (% style="color:blue" %)**5. Check the PDP Context Activate/Deactivate** | ||
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 | |||
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.** |