wifi: shell: Return text description of connection error

If "wifi connect" fails, tell user why in textual format.
This helps debugging connectivity issues.

Signed-off-by: Jukka Rissanen <jukka.rissanen@nordicsemi.no>

include/zephyr/net/wifi.h

@@ -38,6 +38,33 @@
 extern "C" {
 #endif
 
+/** @brief Wi-Fi connect result codes. To be overlaid on top of \ref wifi_status
+ * in the connect result event for detailed status.
+ */
+enum wifi_conn_status {
+	/** Connection successful */
+	WIFI_STATUS_CONN_SUCCESS = 0,
+	/** Connection failed - generic failure */
+	WIFI_STATUS_CONN_FAIL,
+	/** Connection failed - wrong password
+	 * Few possible reasons for 4-way handshake failure that we can guess are as follows:
+	 * 1) Incorrect key
+	 * 2) EAPoL frames lost causing timeout
+	 *
+	 * #1 is the likely cause, so, we convey to the user that it is due to
+	 * Wrong passphrase/password.
+	 */
+	WIFI_STATUS_CONN_WRONG_PASSWORD,
+	/** Connection timed out */
+	WIFI_STATUS_CONN_TIMEOUT,
+	/** Connection failed - AP not found */
+	WIFI_STATUS_CONN_AP_NOT_FOUND,
+	/** Last connection status */
+	WIFI_STATUS_CONN_LAST_STATUS,
+	/** Connection disconnected status */
+	WIFI_STATUS_DISCONN_FIRST_STATUS = WIFI_STATUS_CONN_LAST_STATUS,
+};
+
 /** @brief IEEE 802.11 security types. */
 enum wifi_security_type {
 	/** No security. */
@@ -708,6 +735,9 @@ enum wifi_ap_config_param {
 	WIFI_AP_CONFIG_PARAM_VHT_CAPAB = BIT(4),
 };
 
+/** Helper function to get user-friendly status name for the status code. */
+const char *wifi_conn_status_txt(enum wifi_conn_status status);
+
 #ifdef __cplusplus
 }
 #endif

include/zephyr/net/wifi_mgmt.h

@@ -587,33 +587,6 @@ struct wifi_connect_req_params {
 	enum wifi_frequency_bandwidths bandwidth;
 };
 
-/** @brief Wi-Fi connect result codes. To be overlaid on top of \ref wifi_status
- * in the connect result event for detailed status.
- */
-enum wifi_conn_status {
-	/** Connection successful */
-	WIFI_STATUS_CONN_SUCCESS = 0,
-	/** Connection failed - generic failure */
-	WIFI_STATUS_CONN_FAIL,
-	/** Connection failed - wrong password
-	 * Few possible reasons for 4-way handshake failure that we can guess are as follows:
-	 * 1) Incorrect key
-	 * 2) EAPoL frames lost causing timeout
-	 *
-	 * #1 is the likely cause, so, we convey to the user that it is due to
-	 * Wrong passphrase/password.
-	 */
-	WIFI_STATUS_CONN_WRONG_PASSWORD,
-	/** Connection timed out */
-	WIFI_STATUS_CONN_TIMEOUT,
-	/** Connection failed - AP not found */
-	WIFI_STATUS_CONN_AP_NOT_FOUND,
-	/** Last connection status */
-	WIFI_STATUS_CONN_LAST_STATUS,
-	/** Connection disconnected status */
-	WIFI_STATUS_DISCONN_FIRST_STATUS = WIFI_STATUS_CONN_LAST_STATUS,
-};
-
 /** @brief Wi-Fi disconnect reason codes. To be overlaid on top of \ref wifi_status
  * in the disconnect result event for detailed reason.
  */

subsys/net/l2/wifi/wifi_mgmt.c

@@ -333,6 +333,24 @@ const char *wifi_ps_exit_strategy_txt(enum wifi_ps_exit_strategy ps_exit_strateg
 	}
 }
 
+const char *wifi_conn_status_txt(enum wifi_conn_status status)
+{
+	switch (status) {
+	case WIFI_STATUS_CONN_SUCCESS:
+		return "Connection successful";
+	case WIFI_STATUS_CONN_FAIL:
+		return "Connection failed";
+	case WIFI_STATUS_CONN_WRONG_PASSWORD:
+		return "Wrong password";
+	case WIFI_STATUS_CONN_TIMEOUT:
+		return "Connection timeout";
+	case WIFI_STATUS_CONN_AP_NOT_FOUND:
+		return "AP not found";
+	default:
+		return "UNKNOWN";
+	}
+}
+
 static const struct wifi_mgmt_ops *const get_wifi_api(struct net_if *iface)
 {
 	const struct device *dev = net_if_get_device(iface);

subsys/net/l2/wifi/wifi_shell.c

@@ -315,7 +315,9 @@ static void handle_wifi_connect_result(struct net_mgmt_event_callback *cb)
 	const struct shell *sh = context.sh;
 
 	if (status->status) {
-		PR_WARNING("Connection request failed (%d)\n", status->status);
+		PR_WARNING("Connection request failed (%s/%d)\n",
+			   wifi_conn_status_txt(status->status),
+			   status->status);
 	} else {
 		PR("Connected\n");
 	}