Hello, I am currently learning to use nRF9160 DK in Guangzhou, China.
It is weird that my China Mobile cellphone SIM card can be used on this DK to connect to Cloud. However, iBasics SIM and China Telecom NBIOT SIM cannot connect to Cloud.
While using iBasics, it's LED3 that keeps blinking. While using China Telecom, LED3 blinks first, then LED4 blinks, LED1 and LED4 blinks at last.
The following is from nRF Connect during the entire session for China Telecom
+CSCON: 1
[00:00:08.419,586]
[0m<inf> asset_tracker: RRC mode: Connected
[0m
+CEREG: 1,"765E","075D6450",9,,,"11100000","00111000"
[00:00:10.095,031]
[0m<inf> asset_tracker: Connected to LTE network.
[0m
[00:00:10.101,623]
[0m<inf> asset_tracker: Connecting to cloud, attempt 1 of 8
[0m
[00:00:10.109,039]
[0m<inf> asset_tracker: Cloud connection request sent.
[0m
[00:00:10.115,966]
[0m<inf> asset_tracker: Connection response timeout is set to 30 seconds.
[0m
[00:00:10.124,664]
[0m<inf> asset_tracker: Network registration status: Connected - home network
[0m
[00:00:10.133,544]
[0m<inf> asset_tracker: PSM parameter update: TAU: 86400, Active time: -1
[0m
[00:00:10.142,242]
[0m<dbg> nrf_cloud.api_event_handler: NRF_CLOUD_EVT_TRANSPORT_CONNECTING
[0m
[00:00:10.150,695]
[0m<inf> asset_tracker: CLOUD_EVT_CONNECTING
[0m
[00:00:20.343,505]
[0m<dbg> nrf_cloud_transport.nct_connect: IPv4 address: 54.166.31.114
[0m
[00:00:20.351,715]
[0m<dbg> nrf_cloud_transport.nct_mqtt_connect: MQTT clean session flag: 0
[0m
[00:00:25.044,555]
[1;33m<wrn> date_time: sntp_query, error: -116
[0m
[00:00:32.817,443]
[1;33m<wrn> date_time: sntp_query, error: -116
[0m
[00:00:38.944,549]
[1;33m<wrn> date_time: sntp_query, error: -116
[0m
[00:00:44.977,661]
[1;33m<wrn> date_time: sntp_query, error: -116
[0m
[00:00:51.057,739]
[1;33m<wrn> date_time: sntp_query, error: -116
[0m
[00:00:51.064,270]
[1;33m<wrn> date_time: Not getting time from any NTP server
[0m
[00:00:51.072,357]
[0m<inf> asset_tracker: DATE_TIME_OBTAINED_MODEM
[0m
+CSCON: 0
[00:01:16.166,137]
[0m<inf> asset_tracker: RRC mode: Idle
[0m
+CSCON: 1
[00:01:21.380,767]
[0m<inf> asset_tracker: RRC mode: Connected
[0m
+CSCON: 0
[00:01:43.162,567]
[0m<inf> asset_tracker: RRC mode: Idle
[0m
+CSCON: 1
[00:02:13.541,534]
[0m<inf> asset_tracker: RRC mode: Connected
[0m
+CSCON: 0
[00:02:35.173,370]
[0m<inf> asset_tracker: RRC mode: Idle
[0m
[00:03:00.723,693]
[0m<dbg> nrf_cloud_transport.nct_mqtt_connect: mqtt_connect failed -22
[0m
[00:03:00.732,025]
[0m<dbg> nrf_cloud.api_event_handler: NRF_CLOUD_EVT_TRANSPORT_CONNECTING
[0m
[00:03:00.740,509]
[0m<inf> asset_tracker: CLOUD_EVT_CONNECTING
[0m
[00:03:00.746,582]
[1;31m<err> asset_tracker: Failed to connect to cloud, error -7
[0m
[00:03:00.754,333]
[1;31m<err> asset_tracker: Ensure device has a valid private key
[0m
[00:03:00.762,145]
[1;31m<err> asset_tracker: Device will reboot in 300 seconds
[0m
[00:03:00.769,653]
[1;31m<err> asset_tracker: LTE link disconnect
[0m
+CSCON: 1
[00:03:01.222,259]
[0m<inf> asset_tracker: RRC mode: Connected
[0m
+CEREG: 0,"765E","075D6450",9,0,0,"11100000","11100000"
+CSCON: 0
[00:03:06.757,415]
[0m<inf> asset_tracker: RRC mode: Idle
[0m
[00:03:07.170,684]
[1;31m<err> asset_tracker: Shutdown modem
[0m