DTLS only supports a single request

[ptone]

Only the first request is responded to.

I've been trying to trace it through the differences between server.handleIncomingDTLSData and server.handleIncomingData

but without luck

[ptone]

I've tracked it as far as C.SSL_read in DTLSServerSession.Read but not sure I'll go any further.

DTLS in go is in a sad state :( golang/go#13525

[franzwilhelm]

@ptone did you manage to run the client?