Cannot connect using connection manager

Question

Hi,

I'm trying to use the connection manager in my application, but it never connects or shows any events. I've tried using the https_client sample as well, but that gives me the same result.

There's an existing thread which mirrors the exact same issue I'm experiencing. NRF9160 Connection Manager with LTE

I'm able to connect to an LTE network manually like so:

nrf_modem_lib_init();
modem_info_init();
lte_lc_register_handler(lte_event_handler);
lte_lc_connect_async(lte_event_handler);

I'm testing on SDK v3.2.1 with nRF9160dk. This is the log output I'm getting from the https_client sample:

HTTPS client sample started
[00:00:00.386,016] <dbg> net_mgmt: net_mgmt_add_event_callback: (main): Adding event callback 0x2000d330
[00:00:00.386,077] <dbg> net_mgmt: net_mgmt_add_event_callback: (main): Adding event callback 0x2000d318
Bringing network interface up
[00:00:00.386,138] <dbg> net_if: net_if_up: (main): iface 1 (0x2000d288)
[00:00:00.386,199] <dbg> net_mgmt: net_mgmt_event_notify_with_info: (main): Notifying Event layer 0x2 code 0x1 type 0x8
[00:00:00.386,322] <dbg> net_mgmt: mgmt_event_work_handler: (net_mgmt): Handling events, forwarding it relevantly
[00:00:00.386,383] <dbg> net_mgmt: mgmt_run_slist_callbacks: (net_mgmt): Event layer 0x2 code 0x1 cmd 0x8
[00:00:00.386,444] <dbg> net_mgmt: mgmt_run_slist_callbacks: (net_mgmt): Running callback 0x2000e198 : 0x1d689
[00:00:00.386,627] <dbg> net_if: update_operational_state: (main): iface 1 (0x2000d288), oper state UP admin UP carrier ON dormant OFF
[00:00:00.386,688] <dbg> net_mgmt: net_mgmt_event_notify_with_info: (main): Notifying Event layer 0x2 code 0x1 type 0x2
[00:00:00.386,779] <dbg> net_mgmt: mgmt_event_work_handler: (net_mgmt): Handling events, forwarding it relevantly
[00:00:00.386,840] <dbg> net_mgmt: mgmt_run_slist_callbacks: (net_mgmt): Event layer 0x2 code 0x1 cmd 0x2
[00:00:00.386,901] <dbg> net_mgmt: mgmt_run_slist_callbacks: (net_mgmt): Running callback 0x2000e168 : 0x1d1ed
[00:00:00.386,962] <dbg> conn_mgr: conn_mgr_iface_events_handler: (net_mgmt): Iface event 0xd010000000000002 received on iface 1 (0x2000d288)
[00:00:00.386,993] <dbg> conn_mgr: conn_mgr_iface_events_handler: (net_mgmt): Iface index 0
Provisioning certificate
Connecting to the network

Is there something extra that needs to be done which the sample doesn't show? I recall being able to use the connection manager successfully in an earlier SDK version, but having trouble remembering now. Is anyone able to connect using the sample, or suggest what could be going wrong?

Thanks

Øyvind · Accepted Answer

Hello, thanks for elaborating. 
 Adamcs said: I just wanted to use the connection manger in order to easily know connected/disconnected status, where I'm currently using lte_lc_handler and date_time_handler in order to determine when the device has internet access. 
 The LTE Link Control is recommended for our nRF91-series which provides functionality to control the LTE link on an nRF91 Series SiP. 
 Adamcs said: The NET_EVENT_L4_CONNECTED indicates that the device is on the network, and an IP address, and is able to connect over MQTT, correct? 
 Yes, this is correct. From nrf/samples/cellular/nrf_cloud_mqtt_device_message/src/main.c , and the logs look correct in regards to connection and functionality. 
 static void l4_event_handler(struct net_mgmt_event_callback *cb, uint64_t event,
 struct net_if *iface)
{
	if ((event & EVENT_MASK) != event) {
 return;
	}

if (event == NET_EVENT_L4_CONNECTED) {
 /* Mark network as up. */
 dk_set_led(LTE_LED_NUM, 1);
 LOG_INF("Connected to LTE");
 k_event_post(&connection_events, NETWORK_UP);
	}

if (event == NET_EVENT_L4_DISCONNECTED) {
 /* Mark network as down. */
 dk_set_led(LTE_LED_NUM, 0);
 LOG_INF("Network connectivity lost!");
	}
} 
 From the logs we see [00:00:05.123,199] <inf> nrf_cloud_mqtt_device_message: Connected to LTE 
 Adamcs said: don't think it would be anything which would cause issues for the connection manager. 
 That sounds correct. My guess is that due to removal of some parts regarding TLS/certificate the sample is connected but is having issues in the send_http_request() (just a guess from my side). 
 Kind regards, Øyvind

Cannot connect using connection manager

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