net: lwm2m: Add event LWM2M_RD_CLIENT_EVENT_REG_UPDATE

New event LWM2M_RD_CLIENT_EVENT_REG_UPDATE to indicate
application that engine starts registration update.

Signed-off-by: Juha Ylinen <[email protected]>

Author: juhaylinen

include/zephyr/net/lwm2m.h

@@ -1983,6 +1983,7 @@ enum lwm2m_rd_client_event {
 	LWM2M_RD_CLIENT_EVENT_QUEUE_MODE_RX_OFF,
 	LWM2M_RD_CLIENT_EVENT_ENGINE_SUSPENDED,
 	LWM2M_RD_CLIENT_EVENT_NETWORK_ERROR,
+	LWM2M_RD_CLIENT_EVENT_REG_UPDATE,
 };
 
 /**

samples/net/lwm2m_client/src/lwm2m-client.c

@@ -222,6 +222,10 @@ static void rd_client_event(struct lwm2m_ctx *client,
 		LOG_ERR("LwM2M engine reported a network error.");
 		lwm2m_rd_client_stop(client, rd_client_event, true);
 		break;
+
+	case LWM2M_RD_CLIENT_EVENT_REG_UPDATE:
+		LOG_DBG("Registration update");
+		break;
 	}
 }
 

subsys/net/lib/lwm2m/lwm2m_rd_client.c

@@ -202,6 +202,8 @@ static void set_sm_state(uint8_t sm_state)
 			client.retries = 0;
 			event = LWM2M_RD_CLIENT_EVENT_NETWORK_ERROR;
 		}
+	} else if (sm_state == ENGINE_UPDATE_REGISTRATION) {
+		event = LWM2M_RD_CLIENT_EVENT_REG_UPDATE;
 	}
 
 	client.engine_state = sm_state;