       // Quits if sig belongs to other teams
       // OR if command is redundant (i.e. already executed)
       if(sig != 0 || ignore(seqNo)){ return; }
+
+      // for accepting file
+      if(sig == 3){
+
+        // get frequency from file.
+        //int frequency = getFrequency(c);
+        
+        // storeStringInRegister(int frequency) 
+
+
+        
+      }
 
       int opcode = getOpcode(c);
       int arg = getArg(c);

int  lastSeqNo;
bool done;

void setup(){
  
  SDPsetup();

//  Serial.write("+++");
//  Serial.write("ATCN20");
//  Serial.write("ATAC");
//  Serial.write(	"ATDN");

  // 1. inital test to see if message is recieved to computer stating "hello world"
   helloWorld();
