In preparation for production, I am testing NB-IoT with China Mobile Hong Kong (CMHK). The same test code runs in Canada as well as in Japan with LTE-M with no problem. The code will connect to our AWS endpoints and send MQTT messages. With CMHK, I can only connect to the NB-IoT network, but can't connect to AWS. There is no error message or error code whatsoever. The code just loops at AWS_IOT_EVT_CONNECTING. Here is a terminal log right from the beginning.
*** Booting Zephyr OS build v3.2.99-ncs2 ***
FOTA version: v1.0.5
mfw_nrf9160_1.3.5
OK
AWS IoT started
Battery: 3547
+CEREG: 2,"C41B","01880BCB",9
LTE cell changed: Cell ID: 25693131, Tracking area: 50203
+CSCON: 1
RRC mode: Connected
+CGEV: ME PDN ACT 0,0
+CNEC_ESM: 50,0
+CEREG: 1,"C41B","01880BCB",9,,,"11100000","11100000"
Network registration status: Connected - home network
PSM parameter update: TAU: 3240, Active time: -1
+CEDRXP: 5,"1001","1001","0011"
eDRX parameter update: eDRX: 163.839996, PTW: 10.240000
%XTIME: "23","42501160244223","00"
Date time obtained
Next connection retry in 30 seconds
AWS_IOT_EVT_CONNECTING
AWS_IOT_EVT_CONNECTING
Next connection retry in 30 seconds
AWS_IOT_EVT_CONNECTING
AWS_IOT_EVT_CONNECTING
+CSCON: 0
RRC mode: Idle
Next connection retry in 30 seconds
AWS_IOT_EVT_CONNECTING
AWS_IOT_EVT_CONNECTING
Next connection retry in 30 seconds
AWS_IOT_EVT_CONNECTING
AWS_IOT_EVT_CONNECTING
Next connection retry in 30 seconds
AWS_IOT_EVT_CONNECTING
AWS_IOT_EVT_CONNECTING
Next connection retry in 30 seconds
AWS_IOT_EVT_CONNECTING
AWS_IOT_EVT_CONNECTING
Next connection retry in 30 seconds
AWS_IOT_EVT_CONNECTING
AWS_IOT_EVT_CONNECTING
I am pretty sure the certificates and endpoint are correct. Any suggestion is much appreciated. Thank you in advance.
