ASP Accessory Symmetric Key Link Manager

SketchSystems.spec

ASP Accessory Symmetric Key Link Manager
  Unlinked
    Unlinked Idle*
      TICK->Broadcast Timeout Expired?
      valid_asp_link_challenge_received->Computing Link Key
    Broadcasting Identity
      send_asp_notify_accessory_unlinked->Unlinked Idle
    Broadcast Timeout Expired?
      timeout expired?->Broadcasting Identity
      timeout not expired?->Unlinked Idle
  Linking
    Computing Link Key
      key_computed_ok->Store Initiator Link Parameters
      key_not_computed_ok-> Error During Linking
    Store Initiator Link Parameters
      initiator_parameters_stored_ok->Respond Confirming Link
      initiator_parameters_not_ok-> Error During Linking
    Respond Confirming Link
      send_asp_205_response_with_link_key->Linked
    Error During Linking
      send_asp_error_message->Unlinked
  Linked
    Linked Idle
      TICK->Link Timeout Expired?
      valid_unlink_command_received->Unlinking
    
    Link Timeout Expired?
      timeout expired?->Unlinked
      timeout not expired?->Linked
  Unlinking
    # spec indicates a 2.02 response, but its non actionable, for debug only.
    # so state machine can ignore it.
    send_asp_002_delete_link_message->Unlinked Idle
  
   

SketchSystems_prototype.js

//A function that draws individual traffic lights
function asp_link_light(color, is_illuminated){
  return $('div', {style: {backgroundColor: color,
                           width: '20px',
                           height: '20px',
                           opacity: is_illuminated ? 1 : 0.2}});
}

//A function that draws all of our lights, based on the current state
function render(model){
  var asp_state = model.active_states[0].parent.name;
  return $('div',
           asp_link_light('Red', asp_state === 'Unlinked'),
           asp_link_light('Yellow', asp_state === 'Linking'),
           asp_link_light('Green', asp_state === 'Linked'),
           "Current ASP State: " + asp_state);
}