diff --git a/firmware/WIZ_Ethernet_Library-master/Arduino IDE 1.5.x/Ethernet/src/utility/w5500.cpp b/firmware/WIZ_Ethernet_Library-master/Arduino IDE 1.5.x/Ethernet/src/utility/w5500.cpp
index b4d9c51..5e9ed78 100644
--- a/firmware/WIZ_Ethernet_Library-master/Arduino IDE 1.5.x/Ethernet/src/utility/w5500.cpp
+++ b/firmware/WIZ_Ethernet_Library-master/Arduino IDE 1.5.x/Ethernet/src/utility/w5500.cpp
@@ -39,6 +39,7 @@
         write( 0x1E, cntl_byte, 2); //0x1E - Sn_RXBUF_SIZE
         write( 0x1F, cntl_byte, 2); //0x1F - Sn_TXBUF_SIZE
     }
+    setRetransmissionCount(4);
 }
 
 uint16_t W5500Class::getTXFreeSize(SOCKET s)
diff --git a/firmware/core/core.ino b/firmware/core/core.ino
index 4e85132..9a69903 100644
--- a/firmware/core/core.ino
+++ b/firmware/core/core.ino
@@ -124,6 +124,8 @@
 void sendEventPacket(uint8_t eventType)
 {
   struct packet p;
+  if(!client.connected())
+    return;
   p.characteristicAndVersion = PacketIdentifier;
   p.type = PacketTypeEvent;
   p.payloadSize = sizeof(eventPayload);
@@ -133,6 +135,8 @@
 
 void sendAuthPacket(uint8_t uidLen, uint8_t* uid)
 {
+  if(!client.connected())
+    return;
   struct packet *p = (packet*)new char[sizeof(packet) + uidLen];
   p->characteristicAndVersion = PacketIdentifier;
   p->type = PacketTypeRequest;