How Receive A MultiCast Package From Net?

[Jack_Zhou]

when i use c4:createserver or c4:createnetworkconnection it can't receive mulicast packages from network how could i receive?

[RyanE]

Below is a snippet from the "KNX Routing Gateway" driver, where it sets up the multicast connection for two-way communication with the Routing Gateway over multicast.

Older versions of the Control4 OS (earlier than 2.10.3) required opening up a server socket just to listen for multicast and also creating a network connection to send multicast.  This snippet opens the appropriate connections based on version.

You would use C4:SendToNetwork the same as any other connection to send.  To receive, use ReceivedFromNetwork, and if that is successful, ignore any data coming in from OnServerDataIn.

It's a little janky, but it does work.

RyanE

function CreateMulticastConnection()

  -- KNX Default Multicast is at: 224.0.23.12:3671
  local knx_multicast_addr = Properties["KNX Multicast Address"] or "224.0.23.12"
  local knx_multicast_port = tonumber(Properties["KNX Multicast Port"]) or 3671

  -- Create Network Binding-based connection for multicast sending/receiving (MULTICAST-L)...
  if (IsVersionGreaterThan("2.10.3.0")) then
    C4:CreateNetworkConnection(MULTICAST_BINDING, knx_multicast_addr)
    C4:NetConnect(MULTICAST_BINDING, knx_multicast_port, "MULTICAST-L") -- New 'Listening' connection
    -- Try to join multicast group periodically until success.
    StartConnectionTimer()
  else
    -- Create Server Socket listener for KNX data... ('binding-based' connection only listens on multicast for OS 2.10.3 or greater)
    C4:CreateServer(knx_multicast_port, "", true)

    C4:CreateNetworkConnection(MULTICAST_BINDING, knx_multicast_addr)
    C4:NetConnect(MULTICAST_BINDING, knx_multicast_port, "MULTICAST") -- Legacy 'Send Only' connection
  end
end

 

[Jack_Zhou]

It work! Thanks