An example application to implement the Fabric Synchronization feature and demonstrates the end-to-end Fabric Synchronization feature using dynamic endpoints.
Fabric Synchronization feature will facilitate the commissioning of end devices from one fabric to another without requiring user intervention for every end device. It defines mechanisms that can be used by multiple ecosystems/controllers to communicate with one another to simplify the experience for users.
This doc is tested on Ubuntu 22.04 LTS (aarch64)
The Fabric-Sync Example makes use of Dynamic Endpoints. Current SDK support is limited for dynamic endpoints, since endpoints are typically defined (along with the clusters and attributes they contain) in a .zap file which then generates code and static structures to define the endpoints.
To support endpoints that are not statically defined, the ZCL attribute storage mechanisms will hold additional endpoint information for NUM_DYNAMIC_ENDPOINTS additional endpoints. These additional endpoint structures must be defined by the application and can change at runtime.
To facilitate the creation of these endpoint structures, several macros are defined:
DECLARE_DYNAMIC_ATTRIBUTE_LIST_BEGIN(attrListName) DECLARE_DYNAMIC_ATTRIBUTE(attId, attType, attSizeBytes, attrMask) DECLARE_DYNAMIC_ATTRIBUTE_LIST_END(clusterRevision)
These three macros are used to declare a list of attributes for use within a cluster. The declaration must begin with the DECLARE_DYNAMIC_ATTRIBUTE_LIST_BEGIN macro which will define the name of the allocated attribute structure. Each attribute is then added by the DECLARE_DYNAMIC_ATTRIBUTE macro. Finally, DECLARE_DYNAMIC_ATTRIBUTE_LIST_END macro should be used to close the definition.
All attributes defined with these macros will be configured as ATTRIBUTE_MASK_EXTERNAL_STORAGE in the ZCL database and therefore will rely on the application to maintain storage for the attribute. Consequently, reads or writes to these attributes must be handled within the application by the emberAfExternalAttributeWriteCallback and emberAfExternalAttributeReadCallback functions. See the bridge application's main.cpp for an example of this implementation.
DECLARE_DYNAMIC_CLUSTER_LIST_BEGIN(clusterListName) DECLARE_DYNAMIC_CLUSTER(clusterId, clusterAttrs, role, incomingCommands, outgoingCommands) DECLARE_DYNAMIC_CLUSTER_LIST_END
DECLARE_DYNAMIC_CLUSTER_LIST_BEGIN macro which will define the name of the allocated cluster structure. Each cluster is then added by the DECLARE_DYNAMIC_CLUSTER macro referencing attribute list previously defined by the DECLARE_DYNAMIC_ATTRIBUTE... macros and the lists of incoming/outgoing commands terminated by kInvalidCommandId (or nullptr if there aren't any commands in the list). Finally, DECLARE_DYNAMIC_CLUSTER_LIST_END macro should be used to close the definition.DECLARE_DYNAMIC_ENDPOINT(endpointName, clusterList)
DECLARE_DYNAMIC_CLUSTER... macros.### For Linux host example:
```
source scripts/activate.sh
./scripts/build/build_examples.py --target linux-x64-fabric-sync-no-ble build
```
### For Raspberry Pi 4 example:
Pull Docker Images
```
docker pull ghcr.io/project-chip/chip-build-crosscompile:90
```
Run docker
```
docker run -it -v ~/connectedhomeip:/var/connectedhomeip ghcr.io/project-chip/chip-build-crosscompile:90 /bin/bash
```
Build
```
cd /var/connectedhomeip
git config --global --add safe.directory /var/connectedhomeip
./scripts/run_in_build_env.sh \
"./scripts/build/build_examples.py \
--target linux-arm64-fabric-sync-no-ble-clang \
build"
```
Transfer the fabric-bridge-app binary to a Raspberry Pi
```
scp ./fabric-sync ubuntu@xxx.xxx.xxx.xxx:/home/ubuntu
```
Building
Follow Building section of this document.
Run Linux Fabric Sync Example App
cd ~/connectedhomeip/ sudo out/debug/fabric-sync