drivers: wifi: esp_at: return WIFI_STATUS_* connect error codes

Return `enum wifi_conn_status` after failed connection attempt. Parse
`+CWJAP:` messages to get failure reason.

Signed-off-by: Marcin Niestroj <m.niestroj@emb.dev>

Author: mniestroj

drivers/wifi/esp_at/esp.c

@@ -416,7 +416,7 @@ MODEM_CMD_DIRECT_DEFINE(on_cmd_cwlap)
 }
 
 /* +CWJAP:(ssid,bssid,channel,rssi) */
-MODEM_CMD_DIRECT_DEFINE(on_cmd_cwjap)
+MODEM_CMD_DIRECT_DEFINE(on_cmd_cwjap_status)
 {
 	struct esp_data *dev = CONTAINER_OF(data, struct esp_data,
 					    cmd_handler_data);
@@ -483,6 +483,34 @@ MODEM_CMD_DIRECT_DEFINE(on_cmd_cwjap)
 	return str - cwjap_buf;
 }
 
+/* +CWJAP:(error) */
+MODEM_CMD_DEFINE(on_cmd_cwjap_connect)
+{
+	struct esp_data *dev = CONTAINER_OF(data, struct esp_data,
+					    cmd_handler_data);
+	long errcode = strtol(argv[0], NULL, 10);
+
+	switch (errcode) {
+	case 1:
+		dev->conn_status = WIFI_STATUS_CONN_TIMEOUT;
+		break;
+	case 2:
+		dev->conn_status = WIFI_STATUS_CONN_WRONG_PASSWORD;
+		break;
+	case 3:
+		dev->conn_status = WIFI_STATUS_CONN_AP_NOT_FOUND;
+		break;
+	case 4:
+		dev->conn_status = WIFI_STATUS_CONN_FAIL;
+		break;
+	default:
+		LOG_WRN("Unknown CWJAP error code: %ld", errcode);
+		break;
+	}
+
+	return 0;
+}
+
 static void esp_dns_work(struct k_work *work)
 {
 #if defined(ESP_MAX_DNS)
@@ -1032,7 +1060,7 @@ static void esp_mgmt_iface_status_work(struct k_work *work)
 	struct wifi_iface_status *status = data->wifi_status;
 	int ret;
 	static const struct modem_cmd cmds[] = {
-		MODEM_CMD_DIRECT("+CWJAP:", on_cmd_cwjap),
+		MODEM_CMD_DIRECT("+CWJAP:", on_cmd_cwjap_status),
 	};
 
 	ret = esp_cmd_send(data, cmds, ARRAY_SIZE(cmds), "AT+CWJAP?",
@@ -1144,6 +1172,7 @@ static void esp_mgmt_connect_work(struct k_work *work)
 	int ret;
 	static const struct modem_cmd cmds[] = {
 		MODEM_CMD("FAIL", on_cmd_fail, 0U, ""),
+		MODEM_CMD("+CWJAP:", on_cmd_cwjap_connect, 1U, ""),
 	};
 
 	dev = CONTAINER_OF(work, struct esp_data, connect_work);
@@ -1153,6 +1182,8 @@ static void esp_mgmt_connect_work(struct k_work *work)
 		goto out;
 	}
 
+	dev->conn_status = WIFI_STATUS_CONN_FAIL;
+
 	ret = esp_cmd_send(dev, cmds, ARRAY_SIZE(cmds), dev->conn_cmd,
 			   ESP_CONNECT_TIMEOUT);
 
@@ -1166,11 +1197,12 @@ static void esp_mgmt_connect_work(struct k_work *work)
 								0);
 		} else {
 			wifi_mgmt_raise_connect_result_event(dev->net_iface,
-							     ret);
+							     dev->conn_status);
 		}
 	} else if (!esp_flags_are_set(dev, EDF_STA_CONNECTED)) {
 		esp_flags_set(dev, EDF_STA_CONNECTED);
-		wifi_mgmt_raise_connect_result_event(dev->net_iface, 0);
+		wifi_mgmt_raise_connect_result_event(dev->net_iface,
+						     WIFI_STATUS_CONN_SUCCESS);
 		net_if_dormant_off(dev->net_iface);
 	}
 

drivers/wifi/esp_at/esp.h

@@ -221,6 +221,7 @@ struct esp_data {
 	uint8_t mode;
 
 	char conn_cmd[CONN_CMD_MAX_LEN];
+	enum wifi_conn_status conn_status;
 
 	/* addresses  */
 	struct in_addr ip;