remove some unneeded parenthesis
initial handshaking for DTLS sessions between DS and clients
detect handshake completion in DS and client
attempt to complete handshake every 100ms instead of every 1s
add processing of DTLS datagrams to domain-server
complete check in and heartbeat via DTLS
output a message when handshake has completed with a client
cleanup node silence timing and use for DTLS timeouts