diff --git a/src_main/io/piethernet.cpp b/src_main/io/piethernet.cpp
index d6abfb6a..1dadd2ca 100755
--- a/src_main/io/piethernet.cpp
+++ b/src_main/io/piethernet.cpp
@@ -143,6 +143,7 @@ PIEthernet::~PIEthernet() {
 
 void PIEthernet::construct() {
 	//piCout << " PIEthernet" << uint(this);
+	setOption(BlockingWrite);
 	piMonitor.ethernets++;
 	connected_ = connecting_ = listen_threaded = server_bounded = false;
 	port_ = port_s = port_r = 0;
@@ -634,7 +635,13 @@ int PIEthernet::writeDevice(const void * data, int max_size) {
 		else*/ PRIVATE->saddr_.sin_addr.s_addr = inet_addr(ip_s.dataAscii());
 		PRIVATE->saddr_.sin_family = AF_INET;
 		//piCoutObj << "write to" << ip_s << ":" << port_s << "socket" << sock_s << max_size << "bytes ...";
-		return ethSendto(sock_s, data, max_size, 0, (sockaddr * )&PRIVATE->saddr_, sizeof(PRIVATE->saddr_));
+		return ethSendto(sock_s, data, max_size,
+#ifndef WINDOWS
+												isOptionSet(BlockingWrite) ? 0 : MSG_DONTWAIT
+#else
+												0
+#endif
+																								, (sockaddr * )&PRIVATE->saddr_, sizeof(PRIVATE->saddr_));
 		//piCout << "[PIEth] write to" << ip_s << ":" << port_s << "ok";
 	case TCP_Client:
 		if (connecting_) {