use common buffer

Network.h

@@ -21,7 +21,7 @@ enum class NetworkDeviceType
 class Network
 {
 public:
-    explicit Network(Preferences* preferences, const String& maintenancePathPrefix);
+    explicit Network(Preferences* preferences, const String& maintenancePathPrefix, char* buffer, size_t bufferSize);
 
     void initialize();
     bool update();
@@ -127,6 +127,10 @@ private:
     bool _mqttEnabled = true;
     static unsigned long _ignoreSubscriptionsTs;
     long _rssiPublishInterval = 0;
+
+    char* _buffer;
+    size_t _bufferSize;
+
     std::function<void()> _keepAliveCallback = nullptr;
     std::vector<std::function<void()>> _reconnectedCallbacks;