Write first checks port existence then check message

dserial-cli/src/commands/WriteCommand.vala

@@ -37,10 +37,6 @@ public class WriteCommand : Object, Command
 
 	public int execute(string[] args, ApplicationState state)
 	{
-		if (args.length == (state.bound_port==null?1:0)) {
-			return error(Err.NO_MESSAGE);
-		}
-
 		Serial.SerialClient p;
 		if(state.bound_port == null) {
 			if(args.length == 0) {
@@ -54,6 +50,10 @@ public class WriteCommand : Object, Command
 			p.reload_properties();
 		}
 
+        if (args.length == (state.bound_port==null?1:0)) {
+			return error(Err.NO_MESSAGE);
+		}
+
 		int start_p = state.bound_port==null?1:0;
 
 		// Build buffer
@@ -71,19 +71,19 @@ public class WriteCommand : Object, Command
 			if(i < args.length-1)
 				buffer[pointer++] = (uint8) 0x20;
 		}
-		
+
 		// Find dollars
 		var dollar_positions = new Array<int>();
 		for(int i = 0; i < char_count; i++) {
 			if(buffer[i] == DOLLAR)
 				dollar_positions.append_val(i);
 		}
-		
+
 		// Check dollar count
 		if(dollar_positions.length%2 == 1) {
 			return error(Err.NOT_MATCHING_DOLLAR_COUNT);
 		}
-		
+
 		var ints = new Array<BigInt>();
 		// Parse ints
 		for ( int i = 0; i < dollar_positions.length; i+=2 ) {
@@ -105,7 +105,7 @@ public class WriteCommand : Object, Command
 				} else {
 					return error(Err.NOT_NUMBER_BETWEEN_DOLLARS);
 				}
-				
+
 				// Read number
 				var exponent = new BigInt();
 				exponent.add_uint8(1);
@@ -119,11 +119,11 @@ public class WriteCommand : Object, Command
 			}
 			ints.append_val(number);
 		}
-		
+
 		var tmp = new uint8[char_count];
 		uint8 tmp_pointer = 0;
 		uint8 dollar_pointer = 0;
-		
+
 		// Construct final message
 		for(int buffer_pointer = 0; buffer_pointer < char_count; buffer_pointer++) {
 			if(buffer[buffer_pointer] == DOLLAR) {
@@ -136,7 +136,7 @@ public class WriteCommand : Object, Command
 				tmp[tmp_pointer++] = buffer[buffer_pointer];
 			}
 		}
-		
+
 
 		stdout.printf("Writing %lli bytes: \n", tmp_pointer);
 		// Print back