Server: Check user input for copter name

Server/copter_table_models.py

@@ -202,12 +202,16 @@ def setData(self, index, value, role=Qt.EditRole):
         if role == Qt.CheckStateRole:
             self.data_contents[row].states.checked = value
         elif role == Qt.EditRole:  # For user actions with data
-            if col == 0: # and self.on_id_changed:
-                #self.data_contents[row][col] = "Awaiting for response"
-                #self.data_contents[row].states.copter_id = None
-
-                self.data_contents[row].client.send_message("id", {"new_id": value})
-                self.data_contents[row].client.remove()
+            if col == 0: 
+                # check user hostname spelling http://man7.org/linux/man-pages/man7/hostname.7.html
+                if value[0] != '-' and len(value) <= 63 and re.match("^[A-Za-z0-9-]*$", value):
+                    self.data_contents[row].client.send_message("id", {"new_id": value})
+                    self.data_contents[row].client.remove()
+                else: 
+                    msg = QtWidgets.QMessageBox()
+                    msg.setIcon(QtWidgets.QMessageBox.Critical)
+                    msg.setText("Wrong input for the copter name!\nPlease use only A-Z, a-z, 0-9, and '-' chars.\nDon't use '-' as first char.")
+                    msg.exec_()
             else:
                 self.data_contents[row][col] = value