Send and Receive SMS Through Tropo

I wanted a Tropo script that could send out text messages via the REST API as well as forward text messages that were received through the Tropo phone number. This snippet shows how I identified and handled the two cases.

if $action == "create"
  # Script called from REST API
  call "+1XXX5551212", {:network => "SMS"}
  say "Sample Message Text"
  # Script called from incoming SMS
  callerId = $currentCall.callerID
  text = $currentCall.initialText
  message "#{callerId} => #{text}", {:to => "+1YYY5551212", :network => "SMS"}