Adds a new handling for reconnects.

measurement_main.py

         print_message("Performing HARD reconnect...")
         try:
             if modem_serial_obj.is_open:
-                modem_serial_obj.write(b'at+cfun=0"\r\n')
+                modem_serial_obj.write(b'at+cfun=4\r\n')
                 sleep(NR_SERIAL_RESPOND_TIME)
                 sleep(2)
                 modem_serial_obj.write(b'at+cfun=1\r\n')
                 os.system("/root/connect-modem.py -s")
                 sleep(5)
                 os.system("/root/connect-modem.py -l {}".format(provider))
-        except:
+        except Exception as e:
             if not modem_serial_obj.is_open:
-                print_message("Serial port is closed.")
+                print_message("Serial port is closed. {}".format(e))
+                os.system("/root/connect-modem.py -s")
             else:
                 print_message(
-                    "Something went wrong while writing to serial."
+                    "Something went wrong while writing to serial. {}".format(e)
                 )
+                os.system("/root/connect-modem.py -s")
     else:
         os.system("/root/connect-modem.py -s")
         sleep(5)