modules: network: Add option to start module in disconnected idle

Add the option to start the module without searching for network
immediately.

Signed-off-by: Jan Tore Guggedal <jantore.guggedal@nordicsemi.no>

Author: jtguggedal

app/src/modules/network/Kconfig.network

@@ -21,6 +21,13 @@ config APP_NETWORK_EXEC_TIME_SECONDS_MAX
 	help
 	  Maximum time allowed for a single execution of the module's thread loop.
 
+config APP_NETWORK_SEARCH_NETWORK_ON_STARTUP
+	bool "Search for network on startup"
+	default y
+	help
+	  If enabled, the module will search for a network on startup.
+	  If disabled, network search must be triggered by a NETWORK_CONNECT message.
+
 module = APP_NETWORK
 module-str = Network
 source "subsys/logging/Kconfig.template.log_config"

app/src/modules/network/network.c

@@ -112,7 +112,11 @@ static const struct smf_state states[] = {
 	[STATE_DISCONNECTED] =
 		SMF_CREATE_STATE(state_disconnected_entry, state_disconnected_run, NULL,
 				 &states[STATE_RUNNING],
+#if defined(CONFIG_APP_NETWORK_SEARCH_NETWORK_ON_STARTUP)
 				 &states[STATE_DISCONNECTED_SEARCHING]),
+#else
+				 &states[STATE_DISCONNECTED_IDLE]),
+#endif /* CONFIG_APP_NETWORK_SEARCH_NETWORK_ON_STARTUP */
 	[STATE_DISCONNECTED_IDLE] =
 		SMF_CREATE_STATE(NULL, state_disconnected_idle_run, NULL,
 				 &states[STATE_DISCONNECTED],