[Silabs] Disconnection issue fix (#23795)

* [Silabs] Disconnection issue fixed

* Restyling the PR

* addressing the comments - changed macro and variable names

* addressing the comments - removed previous commented-out code

* Restyling the PR

* Added comments

* Restyling the PR

* Restyling the PR

* Restyling the PR

* Adressing the comments

* Adressing the comments

* Restyling the PR

* Added comments

* Create function for retry interval

* Restyling the PR

* Restyling the PR

* Addressing the PR comments

* Restyling the PR

Author: riwaghe

examples/platform/silabs/efr32/rs911x/rsi_if.c

@@ -67,6 +67,12 @@ bool hasNotifiedIPV4 = false;
 #endif /* CHIP_DEVICE_CONFIG_ENABLE_IPV4 */
 bool hasNotifiedWifiConnectivity = false;
 
+/* Declare a flag to differentiate between after boot-up first IP connection or reconnection */
+bool is_wifi_disconnection_event = false;
+
+/* Declare a variable to hold connection time intervals */
+uint32_t retryInterval = WLAN_MIN_RETRY_TIMER_MS;
+
 /*
  * This file implements the interface to the RSI SAPIs
  */
@@ -195,12 +201,9 @@ static void wfx_rsi_join_cb(uint16_t status, const uint8_t * buf, const uint16_t
          * We should enable retry.. (Need config variable for this)
          */
         WFX_RSI_LOG("%s: failed. retry: %d", __func__, wfx_rsi.join_retries);
-#if (WFX_RSI_CONFIG_MAX_JOIN != 0)
-        if (++wfx_rsi.join_retries < WFX_RSI_CONFIG_MAX_JOIN)
-#endif
-        {
+        wfx_retry_interval_handler(is_wifi_disconnection_event, wfx_rsi.join_retries++);
+        if (is_wifi_disconnection_event || wfx_rsi.join_retries <= WFX_RSI_CONFIG_MAX_JOIN)
             xEventGroupSetBits(wfx_rsi.events, WFX_EVT_STA_START_JOIN);
-        }
     }
     else
     {
@@ -213,6 +216,8 @@ static void wfx_rsi_join_cb(uint16_t status, const uint8_t * buf, const uint16_t
 #else
         xEventGroupSetBits(wfx_rsi.events, WFX_EVT_STA_CONN);
 #endif
+        wfx_rsi.join_retries = 0;
+        retryInterval        = WLAN_MIN_RETRY_TIMER_MS;
     }
 }
 
@@ -228,9 +233,10 @@ static void wfx_rsi_join_cb(uint16_t status, const uint8_t * buf, const uint16_t
  *********************************************************************/
 static void wfx_rsi_join_fail_cb(uint16_t status, uint8_t * buf, uint32_t len)
 {
-    WFX_RSI_LOG("%s: error: failed status: %02x on try %d", __func__, status, wfx_rsi.join_retries);
+    WFX_RSI_LOG("%s: error: failed status: %02x", __func__, status);
     wfx_rsi.join_retries += 1;
-    wfx_rsi.dev_state &= ~WFX_RSI_ST_STA_CONNECTING;
+    wfx_rsi.dev_state &= ~(WFX_RSI_ST_STA_CONNECTING | WFX_RSI_ST_STA_CONNECTED);
+    is_wifi_disconnection_event = true;
     xEventGroupSetBits(wfx_rsi.events, WFX_EVT_STA_START_JOIN);
 }
 #ifdef RS911X_SOCKETS
@@ -461,6 +467,7 @@ static void wfx_rsi_do_join(void)
     {
         WFX_RSI_LOG("%s: WLAN: connecting to %s==%s, sec=%d", __func__, &wfx_rsi.sec.ssid[0], &wfx_rsi.sec.passkey[0],
                     wfx_rsi.sec.security);
+
         /*
          * Join the network
          */
@@ -469,12 +476,16 @@ static void wfx_rsi_do_join(void)
          */
         wfx_rsi.dev_state |= WFX_RSI_ST_STA_CONNECTING;
 
+        if ((status = rsi_wlan_register_callbacks(RSI_JOIN_FAIL_CB, wfx_rsi_join_fail_cb)) != RSI_SUCCESS)
+        {
+            WFX_RSI_LOG("%s: RSI callback register join failed with status: %02x", __func__, status);
+        }
+
         /* Try to connect Wifi with given Credentials
          * untill there is a success or maximum number of tries allowed
          */
-        while (++wfx_rsi.join_retries < WFX_RSI_CONFIG_MAX_JOIN)
+        while (is_wifi_disconnection_event || wfx_rsi.join_retries <= WFX_RSI_CONFIG_MAX_JOIN)
         {
-
             /* Call rsi connect call with given ssid and password
              * And check there is a success
              */
@@ -485,22 +496,17 @@ static void wfx_rsi_do_join(void)
                 wfx_rsi.dev_state &= ~WFX_RSI_ST_STA_CONNECTING;
                 WFX_RSI_LOG("%s: rsi_wlan_connect_async failed with status: %02x on try %d", __func__, status,
                             wfx_rsi.join_retries);
-                vTaskDelay(4000);
-                /* TODO - Start a timer.. to retry */
+
+                wfx_retry_interval_handler(is_wifi_disconnection_event, wfx_rsi.join_retries);
+                wfx_rsi.join_retries++;
             }
             else
             {
+                WFX_RSI_LOG("%s: starting JOIN to %s after %d tries\n", __func__, (char *) &wfx_rsi.sec.ssid[0],
+                            wfx_rsi.join_retries);
                 break; // exit while loop
             }
         }
-        if (wfx_rsi.join_retries == MAX_JOIN_RETRIES_COUNT)
-        {
-            WFX_RSI_LOG("Connect failed after %d tries", wfx_rsi.join_retries);
-        }
-        else
-        {
-            WFX_RSI_LOG("%s: starting JOIN to %s after %d tries\n", __func__, (char *) &wfx_rsi.sec.ssid[0], wfx_rsi.join_retries);
-        }
     }
 }
 

examples/platform/silabs/efr32/wf200/host_if.cpp

@@ -99,6 +99,12 @@ bool hasNotifiedWifiConnectivity = false;
 static uint8_t retryJoin         = 0;
 bool retryInProgress             = false;
 
+/* Declare a flag to differentiate between after boot-up first IP connection or reconnection */
+bool is_wifi_disconnection_event = false;
+
+/* Declare a variable to hold connection time intervals */
+uint32_t retryInterval = WLAN_MIN_RETRY_TIMER_MS;
+
 #ifdef SL_WFX_CONFIG_SCAN
 static struct scan_result_holder
 {
@@ -394,7 +400,7 @@ static void sl_wfx_connect_callback(sl_wfx_connect_ind_body_t connect_indication
     }
     }
 
-    if ((status != WFM_STATUS_SUCCESS) && retryJoin < MAX_JOIN_RETRIES_COUNT)
+    if ((status != WFM_STATUS_SUCCESS) && (!is_wifi_disconnection_event ? (retryJoin < MAX_JOIN_RETRIES_COUNT) : true))
     {
         retryJoin += 1;
         retryInProgress = false;
@@ -417,7 +423,9 @@ static void sl_wfx_disconnect_callback(uint8_t * mac, uint16_t reason)
     SILABS_LOG("WFX Disconnected %d\r\n", reason);
     sl_wfx_context->state =
         static_cast<sl_wfx_state_t>(static_cast<int>(sl_wfx_context->state) & ~static_cast<int>(SL_WFX_STA_INTERFACE_CONNECTED));
-    xEventGroupSetBits(sl_wfx_event_group, SL_WFX_DISCONNECT);
+    retryInProgress             = false;
+    is_wifi_disconnection_event = true;
+    xEventGroupSetBits(sl_wfx_event_group, SL_WFX_RETRY_CONNECT);
 }
 
 #ifdef SL_WFX_CONFIG_SOFTAP
@@ -534,9 +542,10 @@ static void wfx_events_task(void * p_arg)
         {
             if (!retryInProgress)
             {
+                retryInProgress = true;
+                wfx_retry_interval_handler(is_wifi_disconnection_event, retryJoin);
                 SILABS_LOG("WFX sending the connect command");
                 wfx_connect_to_ap();
-                retryInProgress = true;
             }
         }
 
@@ -589,6 +598,8 @@ static void wfx_events_task(void * p_arg)
             hasNotifiedWifiConnectivity = false;
             SILABS_LOG("WIFI: Connected to AP");
             wifi_extra |= WE_ST_STA_CONN;
+            retryJoin     = 0;
+            retryInterval = WLAN_MIN_RETRY_TIMER_MS;
             wfx_lwip_set_sta_link_up();
 #ifdef SLEEP_ENABLED
             if (!(wfx_get_wifi_state() & SL_WFX_AP_INTERFACE_UP))

src/platform/silabs/ConnectivityManagerImpl_WIFI.cpp

@@ -263,8 +263,10 @@ void ConnectivityManagerImpl::DriveStationState()
         // disconnect the station from the AP, unless the WiFi station mode is currently
         // under application control.
 #ifndef CHIP_ONNETWORK_PAIRING
+        // Incase of station interface disabled & provisioned, wifi_station should not be disconnected.
+        // Device will try to reconnect.
         if (mWiFiStationMode != kWiFiStationMode_ApplicationControlled &&
-            (mWiFiStationMode != kWiFiStationMode_Enabled || !IsWiFiStationProvisioned()))
+            (mWiFiStationMode != kWiFiStationMode_Enabled && !IsWiFiStationProvisioned()))
         {
             ChipLogProgress(DeviceLayer, "Disconnecting WiFi station interface");
             serr = wfx_sta_discon();

src/platform/silabs/EFR32/wifi/wfx_host_events.h

@@ -141,6 +141,12 @@ typedef struct __attribute__((__packed__)) sl_wfx_mib_req_s
 #define MAX_JOIN_RETRIES_COUNT 5
 #endif
 
+// WLAN retry time intervals in milli seconds
+#define WLAN_MAX_RETRY_TIMER_MS 30000
+#define WLAN_MIN_RETRY_TIMER_MS 1000
+#define WLAN_RETRY_TIMER_MS 5000
+#define CONVERT_MS_TO_SEC(TimeInMS) (TimeInMS / 1000)
+
 // WLAN related Macros
 #define ETH_FRAME 0
 #define CMP_SUCCESS 0
@@ -370,6 +376,9 @@ sl_status_t get_all_counters(void);
 void sl_wfx_host_gpio_init(void);
 sl_status_t sl_wfx_host_process_event(sl_wfx_generic_message_t * event_payload);
 #endif
+
+void wfx_retry_interval_handler(bool is_wifi_disconnection_event, uint16_t retryJoin);
+
 #ifdef __cplusplus
 }
 #endif

src/platform/silabs/EFR32/wifi/wfx_notify.cpp

@@ -46,6 +46,8 @@
 using namespace ::chip;
 using namespace ::chip::DeviceLayer;
 
+extern uint32_t retryInterval;
+
 /*
  * Notifications to the upper-layer
  * All done in the context of the RSI/WiFi task (rsi_if.c)
@@ -187,3 +189,44 @@ void wfx_ip_changed_notify(int got_ip)
         chip::DeviceLayer::PlatformMgr().UnlockChipStack();
     }
 }
+
+/**************************************************************************************
+ * @fn  void wfx_retry_interval_handler(bool is_wifi_disconnection_event, uint16_t retryJoin)
+ * @brief
+ *      Based on condition will delay for a certain period of time.
+ * @param[in]  is_wifi_disconnection_event, retryJoin
+ * @return None
+ ********************************************************************************************/
+void wfx_retry_interval_handler(bool is_wifi_disconnection_event, uint16_t retryJoin)
+{
+    if (!is_wifi_disconnection_event)
+    {
+        /* After the reboot or a commissioning time device failed to connect with AP.
+         * Device will retry to connect with AP upto WFX_RSI_CONFIG_MAX_JOIN retries.
+         */
+        if (retryJoin < MAX_JOIN_RETRIES_COUNT)
+        {
+            SILABS_LOG("%s: Next attempt after %d Seconds", __func__, CONVERT_MS_TO_SEC(WLAN_RETRY_TIMER_MS));
+            vTaskDelay(pdMS_TO_TICKS(WLAN_RETRY_TIMER_MS));
+        }
+        else
+        {
+            SILABS_LOG("Connect failed after max %d tries", retryJoin);
+        }
+    }
+    else
+    {
+        /* After disconnection
+         * At the telescopic time interval device try to reconnect with AP, upto WLAN_MAX_RETRY_TIMER_MS intervals
+         * are telescopic. If interval exceed WLAN_MAX_RETRY_TIMER_MS then it will try to reconnect at
+         * WLAN_MAX_RETRY_TIMER_MS intervals.
+         */
+        if (retryInterval > WLAN_MAX_RETRY_TIMER_MS)
+        {
+            retryInterval = WLAN_MAX_RETRY_TIMER_MS;
+        }
+        SILABS_LOG("%s: Next attempt after %d Seconds", __func__, CONVERT_MS_TO_SEC(retryInterval));
+        vTaskDelay(pdMS_TO_TICKS(retryInterval));
+        retryInterval += retryInterval;
+    }
+}