Hi all, I’m trying to send a UDP broadcast on the local network in order to discover my server. I wrote a udp client/server in c, and it works. Now, I’m trying to convert the client to brighscript, but I can’t get it working. It seems that the server never receives any packets. Right now I’ve stripped the code down to just sending the packet. I then watch the server output to see if the packet is received – it never is.
Here’s the code I’m using:
function Discover()
SEND_PORT = "8881"
KEY_SEND = "SeCrEt"
msgPort = CreateObject("roMessagePort")
sendSock = CreateObject("roDatagramSocket")
sendSock.SetMessagePort(msgPort)
sendAddr = CreateObject("roSocketAddress")
sendAddr.setAddress("255.255.255.255:"+SEND_PORT)
sendSock.setSendToAddress(sendAddr)
sendSock.setBroadcast(true)
sendSock.notifyReadable(true)
data = CreateObject("roByteArray")
data.FromAsciiString(KEY_SEND)
' Sanity Check
?"Data count: "+data.Count().tostr()
sendSock.send(data, 0, data.Count())
' Check error
if sendSock.eAgain()
?"E_AGAIN"
return false
else if sendSock.eAlready()
?"E_ALREADY"
return false
else if sendSock.eDestAddrReq()
?"E_DEST_ADDR_REQ"
return false
else if sendSock.eHostUnreach()
?"E_HOST_UNREACH"
return false
else if sendSock.eInProgress()
?"E_IN_PROGRESS"
return false
else if sendSock.eOk()
?"E_OK"
else if sendSock.eSuccess()
?"E_SUCCESS"
else if sendSock.eWouldBlock()
?"E_WOULD_BLOCK"
return false
end if
continue:
while true
event = wait(1000, msgPort)
if event = invalid
?"Recevieved invalid event"
goto continue
end if
if type(event) <> "roSocketEvent"
?"Received unknown type"
goto continue
end if
?"Message: " + event.GetMessage()
end while
end function
Can anyone see the problem? Any help would be greatly appreciated. Cheers!
Update: I’ve changed the sendToAddress to the network broadcast address, and that seems to work. Changing it to 255.255.255.255 is what breaks it. Any ideas why this is happening? Or alternative approaches?
Here’s the updated code:
function Discover()
SEND_PORT = "8881"
KEY_SEND = "SeCrEt"
msgPort = CreateObject("roMessagePort")
sock = CreateObject("roDatagramSocket")
sock.SetMessagePort(msgPort)
addr = CreateObject("roSocketAddress")
addr.setAddress("0.0.0.0:8882")
sock.setAddress(addr)
sendAddr = CreateObject("roSocketAddress")
sendAddr.setAddress("192.168.128.255:"+SEND_PORT)
sock.setSendToAddress(sendAddr)
sock.setBroadcast(true)
sock.notifyReadable(true)
data = CreateObject("roByteArray")
data.FromAsciiString(KEY_SEND)
' Sanity Check
?"Data count: "+data.Count().tostr()
sock.send(data, 0, data.Count())
' Check error
if sock.eAgain()
?"E_AGAIN"
return false
else if sock.eAlready()
?"E_ALREADY"
return false
else if sock.eDestAddrReq()
?"E_DEST_ADDR_REQ"
return false
else if sock.eHostUnreach()
?"E_HOST_UNREACH"
return false
else if sock.eInProgress()
?"E_IN_PROGRESS"
return false
else if sock.eOk()
?"E_OK"
else if sock.eSuccess()
?"E_SUCCESS"
else if sock.eWouldBlock()
?"E_WOULD_BLOCK"
return false
end if
continue:
while true
event = wait(10000, msgPort)
if event = invalid
?"Recevieved invalid event (Timeout)"
goto continue
end if
if type(event) <> "roSocketEvent"
?"Received unknown type"
goto continue
end if
if event.GetSocketID() = sock.GetID()
if sock.isReadable()
message = sock.receiveStr(68)
?"Message: "+message
end if
end if
end while
end function
