According to BC95-G & BC68 AT Commands Manual V1.5, the timeout for receiving the domain name when executing AT+QDNS is specified as 300 ms.
However, in my case I do not receive any response even after 10 seconds. I therefore retry the command, which results in CME ERROR: 4 (Operation not supported).
My logs are shown below:
09:43:30:469 -> DBG (NB CONN): Modem state: CONFIG
09:43:30:469 -> DBG (UART NB): REQ: AT
09:43:30:469 -> DBG (NB CONN): RES: OK
09:43:30:521 -> DBG (CHATSCRIPT): 1 -> 2
09:43:30:521 -> DBG (NB CONN): Modem state: CONFIG
09:43:30:521 -> DBG (UART NB): REQ: AT+CFUN=0
09:43:30:521 -> DBG (NB CONN): RES: OK
09:43:30:579 -> DBG (CHATSCRIPT): 2 -> 3
09:43:30:579 -> DBG (NB CONN): Modem state: CONFIG
09:43:30:579 -> DBG (UART NB): REQ: ATI
09:43:30:579 -> DBG (NB CONN): RES: Quectel
09:43:30:659 -> DBG (NB CONN): RES: BC68-GV
09:43:30:675 -> DBG (NB CONN): RES: Revision:BC68GVBAR02A02
09:43:30:706 -> DBG (NB CONN): RES: OK
09:43:30:706 -> DBG (CHATSCRIPT): 3 -> 4
09:43:30:732 -> DBG (NB CONN): Modem state: CONFIG
09:43:30:732 -> DBG (UART NB): REQ: AT
09:43:30:732 -> DBG (NB CONN): RES: OK
09:43:30:785 -> DBG (CHATSCRIPT): 4 -> 5
09:43:30:785 -> DBG (NB CONN): Modem state: CONFIG
09:43:30:785 -> DBG (UART NB): REQ: AT+NCONFIG=AUTOCONNECT,FALSE
09:43:30:785 -> DBG (NB CONN): RES: OK
09:43:30:922 -> DBG (CHATSCRIPT): 5 -> 6
09:43:30:922 -> DBG (NB CONN): Modem state: CONFIG
09:43:30:922 -> DBG (UART NB): REQ: AT+NCONFIG=RELEASE_VERSION,14
09:43:30:922 -> DBG (NB CONN): RES: OK
09:43:31:058 -> DBG (CHATSCRIPT): 6 -> 7
09:43:31:058 -> DBG (NB CONN): Modem state: CONFIG
09:43:31:058 -> DBG (UART NB): REQ: AT+NRB
09:43:31:058 -> DBG (NB CONN): RES: REBOOTING
09:43:31:106 -> DBG (NB CONN): RES: REBOOT_CAUSE_APPLICATION_AT
09:43:32:989 -> DBG (NB CONN): RES: Neul
09:43:32:989 -> DBG (NB CONN): RES: OK
09:43:32:989 -> DBG (CHATSCRIPT): 7 -> 8
09:43:33:015 -> DBG (NB CONN): Modem state: CONFIG
09:43:33:015 -> DBG (UART NB): REQ: AT+CMEE=1
09:43:33:015 -> DBG (NB CONN): RES: OK
09:43:33:047 -> DBG (CHATSCRIPT): 8 -> 9
09:43:33:073 -> DBG (NB CONN): Modem state: CONFIG
09:43:33:073 -> DBG (UART NB): REQ: AT+NBAND=20
09:43:33:073 -> DBG (NB CONN): RES: OK
09:43:33:145 -> DBG (CHATSCRIPT): 9 -> 10
09:43:33:145 -> DBG (NB CONN): Modem state: CONFIG
09:43:33:145 -> DBG (UART NB): REQ: AT+NPOWERCLASS=20,6
09:43:33:145 -> DBG (NB CONN): RES: OK
09:43:33:216 -> DBG (CHATSCRIPT): 10 -> 11
09:43:33:216 -> DBG (NB CONN): Modem state: CONFIG
09:43:33:216 -> DBG (UART NB): REQ: AT+CEDRXS=0,5
09:43:33:216 -> DBG (NB CONN): RES: OK
09:43:33:248 -> DBG (CHATSCRIPT): 11 -> 12
09:43:33:274 -> DBG (NB CONN): Modem state: CONFIG
09:43:33:274 -> DBG (UART NB): REQ: AT+CFUN=1
09:43:33:274 -> DBG (NB CONN): RES: OK
09:43:34:430 -> DBG (CHATSCRIPT): 12 -> 13
09:43:34:430 -> DBG (NB CONN): Modem state: CONFIG
09:43:34:430 -> DBG (UART NB): REQ: AT+NCCID?
09:43:34:430 -> DBG (NB CONN): RES: +NCCID:89450422241118359398
09:43:34:494 -> DBG (NB CONN): RES: OK
09:43:34:534 -> DBG (CHATSCRIPT): 13 -> 14
09:43:34:534 -> DBG (NB CONN): Modem state: CONFIG
09:43:34:534 -> DBG (UART NB): REQ: AT+CGDCONT=0,"IP","lpwa.telia.iot"
09:43:34:534 -> DBG (NB CONN): RES: OK
09:43:34:635 -> DBG (CHATSCRIPT): 14 -> 15
09:43:34:635 -> DBG (NB CONN): Modem state: CONFIG
09:43:34:635 -> DBG (UART NB): REQ: AT+QREGSWT=2
09:43:34:635 -> DBG (NB CONN): RES: OK
09:43:34:700 -> DBG (CHATSCRIPT): 15 -> 16
09:43:34:700 -> DBG (NB CONN): Modem state: CONFIG
09:43:34:700 -> DBG (UART NB): REQ: AT+QDNS=1
09:43:34:700 -> DBG (NB CONN): RES: OK
09:43:34:753 -> DBG (CHATSCRIPT): 16 -> 17
09:43:34:753 -> DBG (NB CONN): Modem state: CONFIG
09:43:34:753 -> DBG (UART NB): REQ: AT+CEREG=2
09:43:34:753 -> DBG (NB CONN): RES: OK
09:43:34:785 -> DBG (CHATSCRIPT): 17 -> 18
09:43:34:811 -> DBG (NB CONN): Modem state: CONFIG
09:43:34:811 -> DBG (UART NB): REQ: AT+CFUN=1
09:43:34:811 -> DBG (NB CONN): RES: OK
09:43:34:880 -> DBG (CHATSCRIPT): 18 -> 19
09:43:34:880 -> DBG (NB CONN): Modem state: CONFIG
09:43:34:880 -> DBG (UART NB): REQ: AT+COPS?
09:43:34:880 -> DBG (NB CONN): RES: +COPS:2
09:43:34:912 -> DBG (NB CONN): RES: OK
09:43:34:949 -> DBG (CHATSCRIPT): 19 -> 20
09:43:34:949 -> DBG (NB CONN): Modem state: CONFIG
09:43:34:949 -> DBG (UART NB): REQ: AT+COPS=0
09:43:34:949 -> DBG (NB CONN): RES: OK
09:43:35:006 -> DBG (CHATSCRIPT): 20 -> 21
09:43:35:006 -> DBG (NB CONN): Modem state: CONFIG
09:43:35:006 -> DBG (UART NB): REQ: AT+CGATT?
09:43:35:006 -> DBG (NB CONN): RES: +CEREG:2,0000,00000000,9
09:43:35:134 -> DBG (NB CONN): RES: +CGATT:0
09:43:35:151 -> DBG (NB CONN): RES: OK
09:43:35:187 -> DBG (CHATSCRIPT): 21 -> 22
09:43:35:187 -> DBG (NB CONN): Modem state: ATTACH
09:43:35:187 -> DBG (UART NB): REQ: AT+CGATT?
09:43:35:187 -> DBG (NB CONN): RES: +CGATT:0
09:43:35:218 -> DBG (NB CONN): RES: OK
09:43:35:257 -> DBG (CHATSCRIPT): 22 -> 22
09:43:35:257 -> DBG (NB CONN): Modem state: ATTACH
09:43:35:257 -> DBG (UART NB): REQ: AT+CGATT?
09:43:35:257 -> DBG (NB CONN): RES: +CGATT:0
09:43:35:344 -> DBG (NB CONN): RES: OK
09:43:35:344 -> DBG (CHATSCRIPT): 22 -> 22
...........
09:44:26:797 -> DBG (CHATSCRIPT): 22 -> 22
09:44:26:823 -> DBG (NB CONN): Modem state: ATTACH
09:44:26:823 -> DBG (UART NB): REQ: AT+CGATT?
09:44:26:823 -> DBG (NB CONN): RES: +CGATT:0
09:44:26:871 -> DBG (NB CONN): RES: OK
09:44:26:871 -> DBG (CHATSCRIPT): 22 -> 22
09:44:26:897 -> DBG (NB CONN): Modem state: ATTACH
09:44:26:897 -> DBG (UART NB): REQ: AT+CGATT?
09:44:26:897 -> DBG (NB CONN): RES: +CGATT:0
09:44:26:945 -> DBG (NB CONN): RES: OK
09:44:26:981 -> DBG (CHATSCRIPT): 22 -> 22
09:44:26:981 -> DBG (NB CONN): Modem state: ATTACH
09:44:26:981 -> DBG (UART NB): REQ: AT+CGATT?
09:44:26:981 -> DBG (NB CONN): RES: +CGATT:1
09:44:27:029 -> DBG (NB CONN): RES: OK
09:44:27:029 -> DBG (CHATSCRIPT): 22 -> 23
09:44:27:055 -> DBG (NB CONN): Modem state: CONFIG
09:44:27:055 -> DBG (UART NB): REQ: AT+CSQ
09:44:27:055 -> DBG (NB CONN): RES: +CSQ:18,99
09:44:27:169 -> DBG (NB CONN): RES: OK
09:44:27:169 -> DBG (CHATSCRIPT): 23 -> 24
09:44:27:169 -> DBG (NB CONN): Modem state: CONFIG
09:44:27:169 -> DBG (UART NB): REQ: AT+NPOWERCLASS?
09:44:27:169 -> DBG (NB CONN): RES: +NPOWERCLASS:20,6
09:44:27:203 -> DBG (NB CONN): RES: OK
09:44:27:203 -> DBG (CHATSCRIPT): 24 -> 25
09:44:27:229 -> DBG (NB CONN): Modem state: CONFIG
09:44:27:229 -> DBG (UART NB): REQ: AT+NUESTATS
09:44:27:229 -> DBG (NB CONN): RES: Signal power:-919
09:44:27:293 -> DBG (NB CONN): RES: Total power:-776
09:44:27:308 -> DBG (NB CONN): RES: TX power:140
09:44:27:324 -> DBG (NB CONN): RES: TX time:6415
09:44:27:340 -> DBG (NB CONN): RES: RX time:40552
09:44:27:356 -> DBG (NB CONN): RES: Cell ID:41257288
09:44:27:387 -> DBG (NB CONN): RES: ECL:1
09:44:27:387 -> DBG (NB CONN): RES: SNR:-45
09:44:27:387 -> DBG (NB CONN): RES: EARFCN:6154
09:44:27:403 -> DBG (NB CONN): RES: PCI:46
09:44:27:419 -> DBG (NB CONN): RES: RSRQ:-157
09:44:27:435 -> DBG (NB CONN): RES: OPERATOR MODE:3
09:44:27:451 -> DBG (NB CONN): RES: CURRENT BAND:20
09:44:27:451 -> DBG (NB CONN): RES: OK
09:44:27:493 -> DBG (CHATSCRIPT): 25 -> 26
09:44:27:493 -> DBG (NB CONN): Modem state: CONFIG
09:44:27:493 -> DBG (UART NB): REQ: AT+CEREG?
09:44:27:493 -> DBG (NB CONN): RES: +CEREG:2,2,0000,00000000,9
09:44:27:557 -> DBG (NB CONN): RES: OK
09:44:27:596 -> DBG (CHATSCRIPT): 26 -> 26
09:44:27:596 -> DBG (NB CONN): Modem state: CONFIG
09:44:27:596 -> DBG (UART NB): REQ: AT+CEREG?
09:44:27:596 -> DBG (NB CONN): RES: +CEREG:2,2,0000,00000000,9
09:44:27:659 -> DBG (NB CONN): RES: OK
09:44:27:698 -> DBG (CHATSCRIPT): 26 -> 26
09:44:27:698 -> DBG (NB CONN): Modem state: CONFIG
09:44:27:698 -> DBG (UART NB): REQ: AT+CEREG?
09:44:27:698 -> DBG (NB CONN): RES: +CEREG:2,2,0000,00000000,9
09:44:27:762 -> DBG (NB CONN): RES: OK
...........
09:44:36:531 -> DBG (CHATSCRIPT): 26 -> 26
09:44:36:531 -> DBG (NB CONN): Modem state: CONFIG
09:44:36:531 -> DBG (UART NB): REQ: AT+CEREG?
09:44:36:531 -> DBG (NB CONN): RES: +CEREG:2,2,0000,00000000,9
09:44:36:594 -> DBG (NB CONN): RES: OK
09:44:36:633 -> DBG (CHATSCRIPT): 26 -> 26
09:44:36:633 -> DBG (NB CONN): Modem state: CONFIG
09:44:36:633 -> DBG (UART NB): REQ: AT+CEREG?
09:44:36:633 -> DBG (NB CONN): RES: +CEREG:2,1,61D3,02758948,9
09:44:36:697 -> DBG (NB CONN): RES: OK
09:44:36:779 -> INF (MAIN): Attached to the GSM network for the 1st time
09:44:36:779 -> DBG (MAIN): Uplink trigger: GSM NB connected
...........
09:44:37:839 -> DBG (CHATSCRIPT): 26 -> 27
09:44:37:839 -> DBG (NB CONN): Modem state: CONFIG
09:44:37:839 -> DBG (UART NB): REQ: AT+QIDNSCFG=1.1.1.1,8.8.8.8
09:44:37:839 -> DBG (NB CONN): RES: +CEREG:1,61D3,02758948,9
09:44:37:887 -> DBG (NB CONN): RES: OK
09:44:37:923 -> DBG (CHATSCRIPT): 27 -> 28
09:44:37:923 -> DBG (NB CONN): Modem state: OTHER
09:44:37:923 -> DBG (UART NB): REQ: AT+NSONMI=3
09:44:37:923 -> DBG (NB CONN): RES: OK
09:44:37:954 -> DBG (CHATSCRIPT): 28 -> 31
09:44:37:980 -> DBG (NB CONN): Modem state: UPLOAD
09:44:37:980 -> DBG (UART NB): REQ: AT
09:44:37:980 -> DBG (NB CONN): RES: OK
09:44:38:033 -> DBG (CHATSCRIPT): 31 -> 37
09:44:38:033 -> DBG (NB CONN): Modem state: OTHER
09:44:38:033 -> DBG (UART NB): REQ: AT+CSQ
09:44:38:033 -> DBG (NB CONN): RES: +CSQ:19,99
09:44:38:065 -> DBG (NB CONN): RES: OK
09:44:38:107 -> DBG (CHATSCRIPT): 37 -> 29
09:44:38:107 -> DBG (NB CONN): Modem state: OTHER
09:44:38:107 -> DBG (UART NB): REQ: AT
09:44:38:107 -> DBG (NB CONN): RES: OK
09:44:38:160 -> DBG (CHATSCRIPT): 29 -> 30
09:44:38:160 -> DBG (NB CONN): Modem state: UPLOAD
09:44:38:160 -> DBG (UART NB): REQ: AT+QDNS=0,<my_dns>
09:44:38:160 -> DBG (NB CONN): RES: OK
09:44:38:208 -> WRN (NB CONN): Request resend
09:44:58:110 -> DBG (CHATSCRIPT): 30 -> 30
09:44:58:110 -> DBG (NB CONN): Modem state: UPLOAD
09:44:58:110 -> DBG (UART NB): REQ: AT+QDNS=0,<my_dns>
09:44:58:110 -> DBG (NB CONN): RES: +CME ERROR: 4
09:44:58:209 -> ERR (NB CONN): Operation not supported