The RockBLOCK Naked is used to handle the actual sending and receiving of the Iridium SBD messages. This unit has integrated transceiver, power and antenna and most importantly has been approved to transmit and operate on the Iridium network which allows a working project to be produced without the delay of waiting for FCC approval, etc. In the future I would like to produce my own open source Iridium communication board making use of the available Iridium 9602 transceiver.
Using the Rock 7 web interface a RockBlock can be configured to deliver message to a specific web application URL using HTTP POSTs as detailed in this guide. For the sat.Send the URL will be the sat.Send Meteor web application. The web app will process the POST parameters, store them for display and also forward the message to the relevant SMS number using the Twilio API. For return messages the process is similar, a HTTP POST can be made to the rock7 URL. This will be achieve by using the web app or by sending an SMS to a Twilio number that is associated with the sat.Send (see future post for details and code).