net: shell: add conn_mgr shell commands

Adds commands for triggering conn_mgr functions and
tweaking conn_mgr connectivity flags.

Signed-off-by: Georges Oates_Larsen <georges.larsen@nordicsemi.no>

subsys/net/conn_mgr/conn_mgr_monitor.c

@@ -221,7 +221,7 @@ static void conn_mgr_mon_handle_update(void)
  */
 static void conn_mgr_mon_initial_state(struct net_if *iface)
 {
-	int idx = net_if_get_by_iface(iface) - 1;
+	int idx = conn_mgr_get_index_for_if(iface);
 
 	k_mutex_lock(&conn_mgr_mon_lock, K_FOREVER);
 
@@ -415,4 +415,18 @@ static int conn_mgr_mon_init(void)
 	return 0;
 }
 
+uint16_t conn_mgr_if_state(struct net_if *iface)
+{
+	int idx = conn_mgr_get_index_for_if(iface);
+	uint16_t state = CONN_MGR_IF_STATE_INVALID;
+
+	if (idx < CONN_MGR_IFACE_MAX) {
+		k_mutex_lock(&conn_mgr_mon_lock, K_FOREVER);
+		state = iface_states[idx];
+		k_mutex_unlock(&conn_mgr_mon_lock);
+	}
+
+	return state;
+}
+
 SYS_INIT(conn_mgr_mon_init, APPLICATION, CONFIG_NET_CONNECTION_MANAGER_MONITOR_PRIORITY);

subsys/net/conn_mgr/conn_mgr_private.h

@@ -32,6 +32,9 @@
 #define CONN_MGR_IF_READY_IPV4		BIT(14)
 #define CONN_MGR_IF_READY_IPV6		BIT(15)
 
+/* Special value indicating invalid state. */
+#define CONN_MGR_IF_STATE_INVALID	0xFFFF
+
 /* NET_MGMT event masks */
 #define CONN_MGR_IFACE_EVENTS_MASK	(NET_EVENT_IF_DOWN		| \
 					 NET_EVENT_IF_UP)
@@ -60,4 +63,7 @@ void conn_mgr_init_events_handler(void);
 /* Cause conn_mgr_connectivity to Initialize all connectivity implementation bindings */
 void conn_mgr_conn_init(void);
 
+/* Internal helper function to allow the shell net cm command to safely read conn_mgr state. */
+uint16_t conn_mgr_if_state(struct net_if *iface);
+
 #endif /* __CONN_MGR_PRV_H__ */

subsys/net/lib/shell/CMakeLists.txt

@@ -16,6 +16,7 @@ zephyr_library_sources(events.c)
 zephyr_library_sources(gptp.c)
 zephyr_library_sources(http.c)
 zephyr_library_sources(iface.c)
+zephyr_library_sources(cm.c)
 zephyr_library_sources(ipv4.c)
 zephyr_library_sources(ipv6.c)
 zephyr_library_sources(mem.c)