From 96ae4f0a8a9d5592a4ec69629331641e28f58b24 Mon Sep 17 00:00:00 2001
From: Michael Lagally <Michael.Lagally@oracle.com>
Date: Thu, 25 Feb 2021 15:58:29 +0100
Subject: [PATCH 1/3] initial draft

---
 index.html | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/index.html b/index.html
index 772ecf8..4a8acc1 100644
--- a/index.html
+++ b/index.html
@@ -595,6 +595,32 @@ <h3 id="profile-description-methodology">Methodology</h3>
     </section>
   </section>
 
+  <section id="device-categoriesdevices">
+    <h2>Device Categories</h2>	  
+<p>
+  In a deployment of WoT conforming to the <a href="https://www.w3.org/TR/wot-architecture/#architecture-abstract">WoT Abstract Architecture</a>
+  we see different device types with typical characteristics.
+  They range (sorted in the order of footprint and capabilities) 
+  from small embedded <em>node</em> devices to <em>gateways</em> or <em>hubs</em> 
+  to powerful <em>edge</em> devices and <em>cloud</em> servers.
+  Interoperability between these devices implies that a core set of features and functionalities
+  is available on <em>all</em> of them.
+</p>
+
+<p>The following device categories describe the footprint and characteristics of typical representants of these classes.
+ This is used to identify the possible features and use cases for these device classes.
+
+ <ul>
+ <li>Node - endpoint with typically 64-128 KB of RAM</li>
+ <li>Gateway/Hub - intermediate node, typically a few MB of RAM</li>
+ <li>Edge - </li>
+ <li>Cloud - multiple CPUs, virtualisation, large storage</li>
+ </ul>
+
+</p>
+  </section>
+
+
 
   <!-- <a>Core Profile</a> -->
 

From c4b57d13001699001d54b3c15d54f5aee47237ab Mon Sep 17 00:00:00 2001
From: Michael Lagally <Michael.Lagally@oracle.com>
Date: Thu, 4 Mar 2021 17:40:19 +0100
Subject: [PATCH 2/3] adding categories

---
 index.html | 64 +++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 56 insertions(+), 8 deletions(-)

diff --git a/index.html b/index.html
index 4a8acc1..b84b3d0 100644
--- a/index.html
+++ b/index.html
@@ -608,14 +608,62 @@ <h2>Device Categories</h2>
 </p>
 
 <p>The following device categories describe the footprint and characteristics of typical representants of these classes.
- This is used to identify the possible features and use cases for these device classes.
-
- <ul>
- <li>Node - endpoint with typically 64-128 KB of RAM</li>
- <li>Gateway/Hub - intermediate node, typically a few MB of RAM</li>
- <li>Edge - </li>
- <li>Cloud - multiple CPUs, virtualisation, large storage</li>
- </ul>
+ This is used to identify the possible features and use cases for these device classes.</p>
+
+ <p>
+We are aligned with the classes defined in https://tools.ietf.org/html/rfc7228 for constrained devices,
+however put the bounds on typical sizes of RAM / Flash in the real world.
+Note that this is not a strict categorisation, categories may overlap and not all memory may be available for user applications.</p>
+
+<table>
+<tr>
+  <th>Category</th> 
+  <th>data size (RAM)</th>
+  <th>code size (Flash, ROM, ...)</th>
+  <th>Typical Representant</th>
+</tr>  
+<tr>
+  <td>Class-0, C0</td>
+  <td><< 10 KiB</td>
+  <td><< 100 KiB</td>
+  <td>sensor nodes</td>
+</tr>
+<tr>
+  <td>Class-1, C1</td>
+  <td>~ 10 KiB</td>
+  <td>~ 100 KiB</td>
+  <td></td>
+</tr><tr>
+  <td>Class-2, C2</td>
+  <td>~ 64 KiB</td>
+  <td>~ 256 KiB</td>
+  <td>nodeMCU</td>
+</tr>
+</tr><tr>
+  <td>Class-3, C3</td>
+  <td>~ 64-256 KiB</td>
+  <td>~ 256 KiB - several MBs</td>
+  <td>ISP gateway</td>
+</tr>
+</tr><tr>
+  <td>Class-4, C4</td>
+  <td>~  256 KiB -  several MB</td>
+  <td>~  1 MB - several MB</td>
+  <td>gateway</td>
+</tr>
+</tr><tr>
+  <td>Class-5, C5</td>
+  <td>~ 1 GB</td>
+  <td>~ 1 GB</td>
+  <td>edge</td>
+</tr>
+</tr><tr>
+  <td>Class-6, C6</td>
+  <td>~ several GB</td>
+  <td>~ several GB</td>
+  <td>cloud</td>
+</tr>
+</table>
 
 </p>
   </section>

From c88bf91b9589cb56a5885827061e1e0bbf6641f7 Mon Sep 17 00:00:00 2001
From: Michael Lagally <Michael.Lagally@oracle.com>
Date: Thu, 4 Mar 2021 17:43:55 +0100
Subject: [PATCH 3/3] adding categories

---
 index.html | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/index.html b/index.html
index b84b3d0..a4cba8c 100644
--- a/index.html
+++ b/index.html
@@ -626,13 +626,13 @@ <h2>Device Categories</h2>
   <td>Class-0, C0</td>
   <td><< 10 KiB</td>
   <td><< 100 KiB</td>
-  <td>sensor nodes</td>
+  <td>unsecure sensor nodes</td>
 </tr>
 <tr>
   <td>Class-1, C1</td>
   <td>~ 10 KiB</td>
   <td>~ 100 KiB</td>
-  <td></td>
+  <td>secure sensor node</td>
 </tr><tr>
   <td>Class-2, C2</td>
   <td>~ 64 KiB</td>