+---------+   +-----------------+    +-----------------------------+
 | Status  |   | Firmware Server |    | +------------+ +----------+ |
 | Tracker |   | Status Tracker  |    | |  Firmware  | |Bootloader| |
 | Server  |   | Server          |    | |  Consumer  | |          | |
 +---------+   +-----------------+    | |  +Status   | +----------+ |
      |                |              | |  Tracker   |        |     |
      |                |              | |  Client    |        |     |
      |                |              | +------------+        |     |
      |                |              |      |  IoT Device    |     |
      |                |               `''''''''''''''''''''''''''''
      |                |                     |                |
      |        Query Firmware Version        |                |
      |------------------------------------->|                |
      |        Firmware Version A.B.C        |                |
      |<-------------------------------------|                |
      |                |                     |                |
      |         <<some time later>>          |                |
      |                |                     |                |
    _,...._         _,...._                  |                |
  ,'       `.     ,'       `.                |                |
 |   New     |   |   New     |               |                |
 \ Manifest  /   \ Firmware  /               |                |
  `.._   _,,'     `.._   _,,'                |                |
      `''             `''                    |                |
      |            Push manifest             |                |
      |----------------+-------------------->|                |
      |                |                     |                |
      |                '                     |                '
      |                |                     | Validate       |
      |                |                     | Manifest       |
      |                |                     |---------+      |
      |                |                     |         |      |
      |                |                     |<--------+      |
      |                | Request firmware    |                |
      |                | X.Y.Z               |                |
      |                |<--------------------|                |
      |                |                     |                |
      |                | Firmware X.Y.Z      |                |
      |                |-------------------->|                |
      |                |                     |                |
      |                |                     | Verify         |
      |                |                     | Firmware       |
      |                |                     |--------------+ |
      |                |                     |              | |
      |                |                     |<-------------+ |
      |                |                     |                |
      |                |                     | Store          |
      |                |                     | Firmware       |
      |                |                     |-------------+  |
      |                |                     |             |  |
      |                |                     |<------------+  |
      |                |                     |                |
      |                |                     |                |
      |                |                     | Trigger Reboot |
      |                |                     |--------------->|
      |                |                     |                |
      |                |                     |                |
      |                |                     | __..-------..._'
      |                |                    ,-'               `-.
      |                |                   |      Secure Boot    |
      |                |                   `-.                 _/
      |                |                     |`--..._____,,.,-'
      |                |                     |                |
      | Device running firmware X.Y.Z        |                |
      |<-------------------------------------|                |
      |                |                     |                |
      |                |                     |                |