Wait for Wi-Fi management to start up (#8834)

examples/platform/linux/AppMain.cpp

@@ -65,6 +65,17 @@ using namespace chip::Transport;
 using chip::Shell::Engine;
 #endif
 
+#if CHIP_DEVICE_CONFIG_ENABLE_WPA
+/*
+ * The device shall check every kWifiStartCheckTimeUsec whether Wi-Fi management
+ * has been fully initialized. If after kWifiStartCheckAttempts Wi-Fi management
+ * still hasn't been initialized, the device configuration is reset, and device
+ * needs to be paired again.
+ */
+static constexpr useconds_t kWifiStartCheckTimeUsec = 100 * 1000; // 100 ms
+static constexpr uint8_t kWifiStartCheckAttempts    = 5;
+#endif
+
 namespace {
 void EventHandler(const chip::DeviceLayer::ChipDeviceEvent * event, intptr_t arg)
 {
@@ -76,6 +87,23 @@ void EventHandler(const chip::DeviceLayer::ChipDeviceEvent * event, intptr_t arg
 }
 } // namespace
 
+#if CHIP_DEVICE_CONFIG_ENABLE_WPA
+static bool EnsureWifiIsStarted()
+{
+    for (int cnt = 0; cnt < kWifiStartCheckAttempts; cnt++)
+    {
+        if (chip::DeviceLayer::ConnectivityMgrImpl().IsWiFiManagementStarted())
+        {
+            return true;
+        }
+
+        usleep(kWifiStartCheckTimeUsec);
+    }
+
+    return chip::DeviceLayer::ConnectivityMgrImpl().IsWiFiManagementStarted();
+}
+#endif
+
 int ChipLinuxAppInit(int argc, char ** argv)
 {
     CHIP_ERROR err                                   = CHIP_NO_ERROR;
@@ -120,6 +148,10 @@ int ChipLinuxAppInit(int argc, char ** argv)
     if (LinuxDeviceOptions::GetInstance().mWiFi)
     {
         chip::DeviceLayer::ConnectivityMgrImpl().StartWiFiManagement();
+        if (!EnsureWifiIsStarted())
+        {
+            ChipLogError(NotSpecified, "Wi-Fi Management taking too long to start - device configuration will be reset.");
+        }
     }
 #endif // CHIP_DEVICE_CONFIG_ENABLE_WPA
 

src/platform/Linux/ConnectivityManagerImpl.cpp

@@ -633,6 +633,11 @@ void ConnectivityManagerImpl::StartWiFiManagement()
                                                 kWpaSupplicantObjectPath, nullptr, _OnWpaProxyReady, nullptr);
 }
 
+bool ConnectivityManagerImpl::IsWiFiManagementStarted()
+{
+    return mWpaSupplicant.state == GDBusWpaSupplicant::WPA_INTERFACE_CONNECTED;
+}
+
 void ConnectivityManagerImpl::DriveAPState()
 {
     CHIP_ERROR err = CHIP_NO_ERROR;

src/platform/Linux/ConnectivityManagerImpl.h

@@ -108,6 +108,7 @@ class ConnectivityManagerImpl final : public ConnectivityManager,
 
 #if CHIP_DEVICE_CONFIG_ENABLE_WPA
     void StartWiFiManagement();
+    bool IsWiFiManagementStarted();
 #endif
 
 private: