With the December release of Simplicity Studio SV184.108.40.206 and Gecko SDK Suite v2.7.0, the Silicon Labs proprietary implementation of the Thread (SL-Thread) protocol was removed from the Gecko SDK Suite. The reason for this decision as described in more detail in this Knowledge Base Article (KBA): https://www.silabs.com/community/wireless/zigbee-and-thread/knowledge-base.entry.html/2019/08/01/deprecation_of_slthreadinfavorofopenthread-zNsJ is that Silicon Labs will focus on Supporting the OpenThread implementation of the Thread protocol.
For customers installing Simplicity Studio that need access to the SL-Thread SDK to support existing products, follow this procedure during installation. If Simplicity Studio has already been installed and access to the Wireless Mesh protocols (EmberZNet (Zigbee) and Thread) has been granted, then the SL-Thread SDK can be installed by using the Installation Wizard Package Manager ([Help] > [Update Software] > [Package Manager] and then select the SDKs tab and set the top [Category] filter to [Thread]) (See Step 9).
1. Download the latest Simplicity Studio installer for the chosen operating system.
2. Launch the installer and when the Installation Wizard appears select [Install by Product Group].
3. Select Wireless & RF Families
On the Install Wizard dialog box select the entire [Wireless & RF] product group and then press [Next]. In order to install the SL-Thread SDK, it is necessary to keep all of the wireless protocols selected at this step. SDK filtering can be done at a later step.
4. Sign In if not yet Signed In
The next screen is just an informational screen to show content access for the current user including Thread access. Sign In if necessary or else just press [Next].
5. Filter SDKs to be Installed
At this step SDK filtering can take place to limit the SDKs that will be installed. Note the latest SDKs shown will be part of Gecko SDK Suite version 2.7.0 (and will install Gecko Platform version 2.7.0). The last available Thread SDK (version 2.10.4) is for Gecko SDK Suite 2.6.4. This just means that if any of the latest versions of the other SDKs are left selected, both Gecko SDK Suite 2.7.0 and 2.6.4 will be installed. DO NOT press [Finish] yet.
6. Uncheck [Show Latest Versions] to see SL-Thread SDKs
To gain access to the various SL-Thread SDK versions, scroll down the dialog box and uncheck the [Show Latest Versions] box:
7. Select desired SL-Thread SDK version(s)
Now scroll down through the available packages and select the desired SL-Thread SDK version(s) to be installed. The latest available SL-Thread SDK - 220.127.116.11 is shown selected below. If other SDKs for the same Gecko SDK Suite are desired they can be selected at this step as well. After the selections are made click [Next].
7. Complete the Installation
Accept the license agreement and then click [Finish] to complete the Simplicity Studio installation.
8. Restart Simplicity Studio and Start Thread development
After the installation completes, a prompt will appear to restart Simplicity Studio. After Simplicity Studio restarts, if a product that supports the SL-Thread SDK is attached to the computer and selected in the [Debug Adapters] window or added to the [My Products] window, the Gecko SDK Suite that contains the installed SL-Thread SDK can be set as the [Preferred SDK] and then the available Thread Software Examples will be displayed in the main Launcher window.
9. Use Package Manager to Install SL-Thread SDK to existing Simplicity Studio Installations
As mentioned in the introduction, after Simplicity Studio is installed the [Package Manager] from the [Installation Wizard] can be used to install different SL-Thread SDK version. Setting the [Category] filter to [Thread] and the [Version] filter to [All] will display all of the available SL-Thread SDKs.