get_all_flowchem_devices failed

[cynthiabour]

get_all_flowchem_devices failed in some circumstances (which including device on daisy chain or Ethernet connection).

The error message shows
"Failed to establish a new connection: [WinError 10061] No connection could be made because the target machine actively refused it"

The ping command also disable to connect and throws "Destination host unreachable"

The problem seems come from the wrong url address were provide while running FlowchemDeviceListener(). But I am still not sure how to solve this problem. :(