(Device)            (NGW)                              (App)

      +--------+                                           +--------+
      |  CoAP  |                                           |  CoAP  |
      |  Inner |                                           |  Inner |
      +--------+                                           +--------+
      |  SCHC  |                                           |  SCHC  |
      |  Inner |                                           |  Inner |
      +--------+                                           +--------+
      |  CoAP  |                                           |  CoAP  |
      |  Outer |                                           |  Outer |
      +--------+                                           +--------+
      |  SCHC  |                                           |  SCHC  |
      |  Outer |                                           |  Outer |
      +--------+                                           +--------+
      .  udp   .                                           .  udp   .
      ..........     ..................                    ..........
      .  ipv6  .     .      ipv6      .                    .  ipv6  .
      ..........     ..................                    ..........
      .  schc  .     .  schc  .       .                    .        .
      ..........     ..........       .                    .        .
      .  lpwan .     . lpwan  .       .                    .        .
      ..........     ..................                    ..........  
          ((((LPWAN))))             ------   Internet  ------