diff --git a/main.cpp b/main.cpp
index 3cd9fda..dada414 100644
--- a/main.cpp
+++ b/main.cpp
@@ -27,7 +27,8 @@ static void printUsage()
  -p, --serialport serial port device to use\n\
  -P, --port       tcp port to use\n\
  -b, --baud       set baud rate with termios id\n\
- -r, --rates      list Available baud rates\n";
+ -r, --rates      list Available baud rates\n\
+ -s, --sinkless   run without serial port\n";
 }
 
 static void printRates()
@@ -63,7 +64,7 @@ public:
     std::string portFileName = "/dev/ttyUSB0";
     unsigned short port = 6856;
     int baud = 0000017;
-    bool ignMissingSerialport = false;
+    bool noSerial = false;
 };
 
 static int parseCmdArgs(int argc, char** argv, Config *config)
@@ -90,9 +91,9 @@ static int parseCmdArgs(int argc, char** argv, Config *config)
             if(argc > i) config->baud = atoi(argv[i+1]);
             else return -1;
         }
-        else if (std::string(argv[i]) == "-d")
+        else if (std::string(argv[i]) == "--sinkless" || std::string(argv[i]) == "-s" )
         {
-            config->ignMissingSerialport=true;
+            config->noSerial=true;
         }
         
         else if (std::string(argv[i]) == "-r" || std::string(argv[i]) == "--rates")
@@ -127,13 +128,14 @@ int main(int argc, char* argv[])
     
     std::cout<<"UVOS serial mulitplexer v0.2\n";
     
-    std::cout<<"Using serial port: "<<config.portFileName<<" at "<<config.baud<<" baud\n";
-    int serial = serialport_init(config.portFileName.c_str(), config.baud);
-    if(serial == -1)
+    int serial = -1;
+    if(!config.noSerial)
     {
-        if(config.ignMissingSerialport) std::cout<<"Continuing in demo mode\n";
-        else return 1;
+        std::cout<<"Using serial port: "<<config.portFileName<<" at "<<config.baud<<" baud\n";
+        int serial = serialport_init(config.portFileName.c_str(), config.baud);
+        if(serial == -1) return 1;
     }
+    else std::cout<<"Sinkless mode\n";
 
     std::vector<TCPSocket*> clientSockets;
     
@@ -173,7 +175,15 @@ int main(int argc, char* argv[])
                 {
                     std::cout<<"rec: ";
                     for( int j = 0; j < reclen; j++  )std::cout<<inBuffer[j];
-                    sWrite(serial, inBuffer, reclen);
+                    
+                    if(strncmp( inBuffer, "bcst:", 4 ) == 0)
+                    {
+                        std::cout<<"bcst: ";
+                        for( int j = 4; j < reclen; j++  )std::cout<<inBuffer[j];
+                        for(unsigned int j = 0; j < clientSockets.size(); j++) if(i != j) clientSockets[j]->send(inBuffer+5, reclen-5);
+                        std::cout<<std::endl;
+                    }
+                    
                     std::cout<<std::endl;
                 }
                 else if(reclen == 0)
diff --git a/serial_io.cpp b/serial_io.cpp
index e6006d6..08e27d8 100644
--- a/serial_io.cpp
+++ b/serial_io.cpp
@@ -5,13 +5,12 @@ struct termios toptions;
 void sWrite(int port, char string[], size_t length)
 {
     if(port != -1) write(port, string, length);
-    else for( size_t j = 0; j < length; j++  )std::cout<<string[j];
+    
 }
 
 void sWrite(int port, const char string[], size_t length)
 {
     if(port != -1) write(port, string, length);
-    else for( size_t j = 0; j < length; j++  )std::cout<<string[j];
 }
 
 ssize_t sRead(int port, void *buf, size_t count)