I'm building the `nrf/samples/net/mqtt` sample for the nrf9160dk, specifying a custom certificate inside `src/modules/transport/credentials` as directed in the Kconfig file.
The CA and client certificate / key are specified in the "correct" PEM format, formatted as a C string with newline characters. Sending `at AT%CMNG=2,24,0` correctly reads back the CA certificate.
I'm building with the following flags:
west build -t flash -b nrf9160dk_nrf9160_ns nrf/samples/net/mqtt -DCONFIG_MQTT_HELPER_PORT=8883 -DCONFIG_MQTT_SAMPLE_TRANSPORT_BROKER_HOSTNAME=\"mqtt.preview.playerdata.co.uk\" -DCONFIG_SHELL_BACKEND_RTT=y -DCONFIG_USE_SEGGER_RTT=y -DCONFIG_SHELL=y -DCONFIG_MQTT_HELPER_LOG_LEVEL_DBG=y -DCONFIG_MQTT_LOG_LEVEL_DBG=y -DCONFIG_NRF_MODEM_LIB_LOG_LEVEL_DBG=y -DCONFIG_NRF_MODEM_LOG=y -DCONFIG_MODEM_KEY_MGMT=y -DCONFIG_MQTT_HELPER_SEC_TAG=24 -DCONFIG_MQTT_LIB_TLS=y -DCONFIG_MQTT_LIB=y -DCONFIG_NRF_MODEM_LIB_TRACE=y -DCONFIG_MODEM_KEY_MGMT_LOG_LEVEL_DBG=y -DCONFIG_AT_SHELL=y
The result is that `mqtt_connect` fails with error code -116:
rtt:~$ *** Booting Zephyr OS build v3.3.99-ncs1-1 *** [00:00:00.327,972] <inf> network: Bringing network interface up [00:00:00.328,002] <inf> nrf_modem: Initializing libmodem 2.4.1-lte-7821d3f67ae9 [00:00:00.328,430] <dbg> nrf_modem: Control region at 0x20008000 (0x4e8 bytes) [00:00:00.328,460] <dbg> nrf_modem: TX region at 0x200084e8 (0x2000 bytes) [00:00:00.328,491] <dbg> nrf_modem: RX region at 0x2000a568 (0x2000 bytes) [00:00:00.328,521] <dbg> nrf_modem: Trace region at 0x2000c568 (0x4000 bytes) [00:00:00.329,132] <dbg> mqtt_helper: mqtt_state_set: State transition: MQTT_STATE_UNINIT --> MQTT_STATE_DISCONNECTED [00:00:00.330,352] <dbg> mqtt_helper: mqtt_helper_poll_loop: Waiting for connection_poll_sem --- 14 messages dropped --- [00:00:00.565,216] <dbg> nrf_modem: AT+CEDRXS=3 [00:00:00.565,551] <dbg> nrf_modem: _nrf_modem_lib_init: Modem init callback: 0x30eb7 [00:00:00.565,643] <dbg> nrf_modem: AT%XEPCO=1 [00:00:00.566,070] <dbg> nrf_modem: _nrf_modem_lib_init: Modem init callback: 0xa7cd [00:00:00.566,131] <dbg> nrf_modem: AT+CMEE? [00:00:00.566,589] <dbg> nrf_modem: AT+CMEE=1 [00:00:00.820,465] <dbg> nrf_modem: AT+CMEE=0 [00:00:00.820,861] <dbg> nrf_modem: AT+CMEE? [00:00:00.821,380] <dbg> nrf_modem: AT+CMEE=1 [00:00:02.239,044] <dbg> nrf_modem: AT+CMEE=0 [00:00:02.239,471] <dbg> nrf_modem: AT+CMEE? [00:00:02.239,990] <dbg> nrf_modem: AT+CMEE=1 [00:00:02.297,821] <dbg> nrf_modem: AT+CMEE=0 [00:00:02.298,156] <dbg> nrf_modem: _nrf_modem_lib_init: Modem init callback: 0x30b61 [00:00:02.298,217] <inf> nrf_modem_lib_trace: Trace thread ready [00:00:02.298,339] <dbg> nrf_modem: AT%XMODEMTRACE=1,2 [00:00:02.299,713] <inf> nrf_modem_lib_trace: Trace level override: 2 [00:00:02.299,835] <dbg> nrf_modem: AT%XSYSTEMMODE? [00:00:02.300,384] <dbg> nrf_modem: AT+CEREG=5 [00:00:02.306,823] <dbg> nrf_modem: AT+CSCON=1 [00:00:02.307,250] <inf> network: Connecting... [00:00:02.307,373] <dbg> nrf_modem: AT+CEREG=5 [00:00:02.307,769] <dbg> nrf_modem: AT+CSCON=1 [00:00:02.308,197] <dbg> nrf_modem: AT+CFUN=21 [00:00:02.339,050] <dbg> nrf_modem: AT+CNEC=16 [00:00:02.339,538] <dbg> nrf_modem: AT+CGEREP=1 [00:00:04.756,774] <dbg> nrf_modem: AT+CGPADDR=0 [00:00:04.858,642] <inf> network: IP Up [00:00:09.858,978] <dbg> nrf_modem: AT+CGSN [00:00:09.859,649] <dbg> mqtt_helper: broker_init: Resolving IP address for mqtt.preview.playerdata.co.uk [00:00:09.859,741] <inf> nrf_modem: getaddrinfo() fam: 0x0, type 0x1, proto 0x6 [00:00:10.010,253] <inf> nrf_modem: RPC_IP_GETADDRINFO_RES, result RPC_IP_ERR_OK [00:00:10.010,345] <dbg> nrf_modem: ai_length 0x39, ai_family 0x1, ai_addrlen 0x4, ai_namelen 0x1d [00:00:10.010,437] <inf> nrf_modem: Resolved 34.105.196.147 [00:00:10.010,681] <dbg> mqtt_helper: broker_init: IPv4 Address found 34.105.196.147 (AF_INET) [00:00:10.010,742] <dbg> mqtt_helper: mqtt_state_set: State transition: MQTT_STATE_DISCONNECTED --> MQTT_STATE_TRANSPORT_CONNECTING [00:00:10.010,803] <inf> nrf_modem: socket() fam 0x1, type 0x1, proto 0x102 [00:00:10.011,108] <inf> nrf_modem: RPC_IP_OPEN_RES, result RPC_IP_ERR_OK [00:00:10.011,230] <dbg> nrf_modem: TLS peer verification 2, fd 0x0 [00:00:10.011,291] <dbg> nrf_modem: TLS tags: 1, fd 0x0 [00:00:10.011,413] <dbg> nrf_modem: TLS hostname: mqtt.preview.playerdata.co.uk, fd 0x0 [00:00:10.011,444] <inf> nrf_modem: connect() fd 0x0 [00:00:10.011,505] <inf> nrf_modem: sa_family 0x1, destaddr_len 0x4, destport 8883 [00:00:10.071,563] <inf> nrf_modem: RPC_IP_CONNECT_RES fd 0x0, result RPC_IP_ERR_OK [00:00:10.071,655] <dbg> nrf_modem: Waiting for handshake semaphore [00:00:10.071,746] <inf> nrf_modem: Attaching sock fd 0x0 [00:00:10.071,777] <dbg> nrf_modem: Hostname: mqtt.preview.playerdata.co.uk [00:00:10.071,838] <dbg> nrf_modem: role 0x2, verify 0x2, cache 0x0, tags count 1 [00:00:10.071,868] <dbg> nrf_modem: tag[0]: 24 [00:00:10.115,631] <inf> nrf_modem: RPC_IP_TLS_ATTACH_RES fd 0x0, result RPC_IP_ERR_OK [00:00:27.930,206] <inf> nrf_modem: RPC_IP_CLOSED_NTF fd 0x0 [00:00:27.930,236] <inf> nrf_modem: Close reason RPC_IP_ERR_CONN_RESET [00:00:27.931,030] <inf> nrf_modem: RPC_IP_TLS_HANDSHAKE_COMPLETE_NTF fd 0x0, result RPC_IP_ERR_TIMEOUT [00:00:27.931,121] <inf> nrf_modem: close() fd 0x0 [00:00:27.932,403] <inf> nrf_modem: RPC_IP_CLOSE_RES fd 0x0, result RPC_IP_ERR_OK [00:00:27.932,525] <err> mqtt_helper: mqtt_connect, error: -116 [00:00:27.932,556] <dbg> mqtt_helper: mqtt_state_set: State transition: MQTT_STATE_TRANSPORT_CONNECTING --> MQTT_STATE_DISCONNECTED [00:00:27.932,586] <err> transport: Failed connecting to MQTT, error code: -116
Checking the server logs, it doesn't appear that the board has attempted to make a connection with the MQTT server.
