diff --git a/readme.md b/readme.md
new file mode 100644
index 0000000..20880dc
--- /dev/null
+++ b/readme.md
@@ -0,0 +1,4 @@
+# Addresed Networking Over UART (ANOU)
+## Elmélet
+Ennek a protokollnak a lényege, hogy egy egyszerű L3 réteget lehessen helyezni
+az eléggé limitált UART protokoll fölé. 
diff --git a/src/anou.cpp b/src/anou.cpp
index dd3a8a2..362f42e 100644
--- a/src/anou.cpp
+++ b/src/anou.cpp
@@ -24,17 +24,17 @@ class ANOUServer
     char* addresses;
 
 public:
-    char ConfigureSerialPort()
+    int ConfigureSerialPort()
     {
 
     }
 
-    char StartListener()
+    int StartListener()
     {
 
     }
 
-    char WriteSerialPort(char* message)
+    int WriteSerialPort(char* message)
     {
         
     }
@@ -47,6 +47,8 @@ public:
         full_message[0] = TYPE_START + dst_addr << 2;
         for (char i = 0; i < message_size; i++) full_message[i+1] = message[i];
         full_message[message_size+1] = TYPE_STOP + dst_addr << 2;
+
+        return full_message;
     }
 
     char* Response(char address)
@@ -82,11 +84,25 @@ public:
         return message;
     }
 
-    char SHAW(char address, bool force_readdress = false)
+    int SHAW(char address = -1, bool force_readdress = false)
     {
         //Stateful Host Addressing Waterfall protocol
         //sends out an addressing message with the address it wants to 
         //assign. This will be assigned to the first client without an address
+        if (address == -1) {
+            //if no address is effectively specified, select the first available
+            //address
+
+            for (int i = 0; i < sizeof(addresses)/sizeof(int); i++)
+            {
+                if (i != addresses[i]) {
+                    address = i;
+                    break;
+                }
+            }
+
+        }
+
         char message[2] = {
             TYPE_SHAW + address << 2,
             0b0
@@ -104,6 +120,9 @@ public:
         }
 
         WriteSerialPort(AssemblePacket(message, ADDR_BROADCAST));
+        //no need for response packet; the SHAW packet can only come
+        //from the host, therefore the clients will always ACK to the
+        //host address
     }
 
 };
\ No newline at end of file
diff --git a/src/anou.h b/src/anou.h
index 90ef5dd..626ad7d 100644
--- a/src/anou.h
+++ b/src/anou.h
@@ -11,11 +11,11 @@ class ANOUServer
     char* addresses; //known client addresses
 
 public:
-    char ConfigureSerialPort(); //configuring the serial port
-    char StartListener(); //start listening on the serial port
-    char WriteSerialPort(char* message); //write the message to the serial port
+    int ConfigureSerialPort(); //configuring the serial port
+    int StartListener(); //start listening on the serial port
+    int WriteSerialPort(char* message); //write the message to the serial port
     char* AssemblePacket(char src_addr, char dst_addr, char* message); //assemble the full packet, with the source and destination address too
-    char SHAW(bool force_readdress); //Stateful Host Addressing Waterfall protocol
+    int SHAW(bool force_readdress); //Stateful Host Addressing Waterfall protocol
 
     char* SetVar6(char var_index, int var_value); //used to create a 6 bit long variable altering message
     char* SetVar12(char var_index, int var_value); //used to create a 12 bit long variable altering message