See below some examples for BC66 and BG96 for early release of RRC connection i.e. Release Access Indicator feature (RAI), after receiving response from UDP echo server.
- BC66:
- The qrellock follows directly after the sending, then no more AT commands until the RRC connection released (+ CSCON: 0).
- If the network grants short active time (T3324) less than 10s, then use AT+QCFG=”initlocktime”,1 to make sure the module timers can take advantage of this short active time.
[2019-07-09_12:14:03:390]Leaving the BROM
[2019-07-09_12:14:04:154]
[2019-07-09_12:14:04:154]RDY
[2019-07-09_12:14:04:154]+CFUN: 1
[2019-07-09_12:14:04:791]
[2019-07-09_12:14:04:791]+CPIN: READY
[2019-07-09_12:14:06:030]at+cscon=1;+cereg=4;+qnbiotrai=2;+cpsms? //or qnbiotrai=1 if just UL data
// Optional AT+QCFG=”initlocktime”,1 if really short active timer (<10s) is granted from network.
[2019-07-09_12:14:06:039]+CPSMS: 1,,,”00100011″,”00000010″
[2019-07-09_12:14:06:039]OK
[2019-07-09_12:14:07:984]
[2019-07-09_12:14:07:984]+CSCON: 1
[2019-07-09_12:14:09:757]
[2019-07-09_12:14:09:757]+CEREG: 5,”7A6B”,”007E425D”,9,,,”00010000″,”00010111″
[2019-07-09_12:14:10:125]
[2019-07-09_12:14:10:125]+IP: 10.175.85.37
[2019-07-09_12:14:20:967]ati
[2019-07-09_12:14:20:988]Quectel_Ltd
[2019-07-09_12:14:20:988]Quectel_BC66
[2019-07-09_12:14:20:988]Revision: BC66NBR01A07
[2019-07-09_12:14:20:988]OK
[2019-07-09_12:14:23:386]at+qiopen=1,1,”UDP”,”85.120.160.207″,16666
[2019-07-09_12:14:23:436]OK
[2019-07-09_12:14:23:461]
[2019-07-09_12:14:23:461]+QIOPEN: 1,0
[2019-07-09_12:14:24:911]at+qisend=1,4,4321;+qrellock
[2019-07-09_12:14:24:941]OK
[2019-07-09_12:14:24:974]
[2019-07-09_12:14:24:974]SEND OK
[2019-07-09_12:14:25:685]
[2019-07-09_12:14:25:685]+QIURC: “recv”,1 //data received
[2019-07-09_12:14:25:778]
[2019-07-09_12:14:25:778]+CSCON: 0 // RRC connection released (0.1s later)
[2019-07-09_12:14:30:470]at+qird=1,4
[2019-07-09_12:14:30:484]+QIRD: 4
[2019-07-09_12:14:30:484]4321
[2019-07-09_12:14:30:484]OK
[2019-07-09_12:14:58:543]+QNBIOTEVENT: “ENTER DEEPSLEEP” // After Active Time expired.
BG96 – does not support RAI directly, but RRC can be manually dropped with AT+QCFG=”RRCABORT”,1 after the expected data is received (or time-out).
[2019-07-09_09:52:31:249]ati
[2019-07-09_09:52:31:249]Quectel
[2019-07-09_09:52:31:249]BG96
[2019-07-09_09:52:31:249]Revision: BG96MAR02A08M1GA
[2019-07-09_09:52:31:265]OK
[2019-07-09_09:52:32:174]at+qcsq
[2019-07-09_09:52:32:174]+QCSQ: “CAT-NB1”,-97,-103,110,-4
[2019-07-09_09:52:32:174]OK
[2019-07-09_09:52:32:798]at+cgdcont?
[2019-07-09_09:52:32:798]+CGDCONT: 1,”IP”,”spe.inetd.vodafone.nbiot”,”0.0.0.0″,0,0,0,0
[2019-07-09_09:52:32:819]OK
[2019-07-09_09:52:34:594]at+cops?
[2019-07-09_09:52:34:594]+COPS: 1,0,”vodafone AU DATA ONLY”,9
[2019-07-09_09:52:34:594]OK
[2019-07-09_09:52:37:468]at+cereg?
[2019-07-09_09:52:37:468]+CEREG: 0,5
[2019-07-09_09:52:37:468]OK
[2019-07-09_09:52:39:322]at+qcscon=1;+QURCCFG=”urcport”,”uart1″
[2019-07-09_09:52:39:322]OK
[2019-07-09_09:52:46:944]at+qiopen=1,1,”UDP”,”85.120.160.207″,16666
[2019-07-09_09:52:46:944]OK
[2019-07-09_09:52:46:959]+QIOPEN: 1,0
[2019-07-09_09:52:48:883]at+qisend=1,4
[2019-07-09_09:52:48:883]> 4321
[2019-07-09_09:52:55:642]SEND OK
[2019-07-09_09:52:56:369]+QCSCON: 1,1
[2019-07-09_09:52:56:854]+QIURC: “recv”,1 //data received
[2019-07-09_09:52:59:866]at+qcfg=”rrcabort”,1 //manual RRC release
[2019-07-09_09:52:59:866]OK
[2019-07-09_09:52:59:982]+QCSCON: 1,0 //RRC release 0.1s later
[2019-07-09_09:53:03:505]at+qird=1,4
[2019-07-09_09:53:03:505]+QIRD: 4
[2019-07-09_09:53:03:505]4321
[2019-07-09_09:53:03:505]OK
[2019-07-09_09:53:08:203]at+qiclose=1
[2019-07-09_09:53:13:683]OK
Note that this example log is incomplete for full PSM operation. Additional commands are:
* AT+CPSMS //enable and set the desired PSM timers
* AT+QPSMS //check the timers granted by the network. The BG96 shall use these values to sleep and wake-up automatically.
*AT+QCFG=”psm/enter”,1 //If not receiving any data, then go to sleep immediately after release of radio – save more power!