minor fix to send command

python_driver/shellmatta_transport_serial.py

@@ -38,8 +38,11 @@ class ShellmattaSerial():
 
                 if data.endswith(str.encode(self.prompt)):
                     # return received string without echo and prompt
+                    data = data[:-len(str.encode(self.prompt))]
                     if data.startswith(send_data):
-                        data = data[len(send_data):-len(str.encode(self.prompt))]
+
+                        data = data[len(send_data):]
+
                     break
 
             # todo implement proper retries / sequence checking