name: zap-matter-analysis description: Guidelines and common jq/grep/awk queries for investigating ZAP (.zap) and Matter (.matter) files to understand endpoints, clusters, attributes, and commands.

ZAP and Matter File Analysis Skill

This skill provides instructions and common commands for analyzing ZAP (.zap) and .matter files in the Matter repository. These files define the data model of the applications.

1. ZAP File Analysis (.zap)

ZAP files are JSON files that contain the configuration of endpoints, endpoint types, enabled clusters, attributes, and commands.

1.1 High-level Endpoint Type Investigation

To get a quick overview of all endpoint types, their device types, and enabled clusters (divided into server and client):

jq '.endpointTypes[] | {
  id,
  deviceTypeName,
  server_clusters: [.clusters[] | select(.side == "server" and .enabled == 1) | .name],
  client_clusters: [.clusters[] | select(.side == "client" and .enabled == 1) | .name]
}' <path_to_zap_file>

1.2 List All Endpoints

To see the list of all endpoints and which endpoint type index they map to:

jq '.endpoints[] | {endpointId, endpointTypeName, endpointTypeIndex}' <path_to_zap_file>

1.3 Locate a Cluster (by Code)

To find which endpoint types have a specific cluster enabled (e.g., OnOff cluster with code 6):

jq '.endpointTypes[] | {
  id,
  name,
  clusters: [.clusters[] | select(.code == <cluster_code> and .enabled == 1) | {name, side}]
}' <path_to_zap_file>

1.4 List Enabled Attributes for a Cluster

To list all enabled attributes for a specific cluster (by code and side) across all endpoint types:

jq '.endpointTypes[] | {
  id,
  name,
  enabledAttributes: [.clusters[] | select(.code == <cluster_code> and .side == "<side>" and .enabled == 1) | .attributes?[] | select(.included == 1) | .name]
}' <path_to_zap_file>

Example for OnOff (6) server attributes: Use .code == 6, .side == "server".

1.5 List Enabled Commands for a Cluster

To list all enabled commands for a specific cluster (by code and side) across all endpoint types:

jq '.endpointTypes[] | {
  id,
  name,
  enabledCommands: [.clusters[] | select(.code == <cluster_code> and .side == "<side>" and .enabled == 1) | .commands?[] | select(.isEnabled == 1) | .name]
}' <path_to_zap_file>

Example for OnOff (6) server commands: Use .code == 6, .side == "server".

1.6 ZAP File Format Schema

Since .zap files are standard JSON, they can be parsed, validated, and queried programmatically. Below is the schema/structure of a .zap file:

  • Top-Level Structure:

    • fileFormat (number): Version of the ZAP file format.
    • featureLevel (number): ZAP feature level.
    • creator (string): Tool that created it (usually "zap").
    • keyValuePairs (array): Key-value settings for the session (e.g., default response policy).
    • package (array): ZCL and generation templates used by this file.
    • endpointTypes (array): Definitions of endpoint types (clusters, attributes, commands).
    • endpoints (array): Instances of endpoints mapping to endpointTypes.

  • endpointTypes Object:

    • id (number): Unique ID for the endpoint type.
    • name (string): Name of the endpoint type.
    • deviceTypeName (string): Device type name (e.g., "MA-onofflight").
    • deviceTypeCode (number): Device type code (e.g., 256).
    • clusters (array): Clusters enabled on this endpoint type.

  • clusters Object (inside endpointTypes):

    • name (string): Cluster name (e.g., "On/Off").
    • code (number): Cluster ID (e.g., 6).
    • side (string): "client" or "server".
    • enabled (number): 1 if enabled, 0 if disabled.
    • attributes (array, optional): Configuration of attributes for this cluster.
    • commands (array, optional): Configuration of commands for this cluster.
    • events (array, optional): Configuration of events for this cluster.

  • attributes Object (inside clusters):

    • name (string): Attribute name.
    • code (number): Attribute ID.
    • included (number): 1 if enabled on this endpoint, 0 otherwise.
    • storageOption (string): "RAM", "External", etc.
    • defaultValue (string/null): Default value.

  • commands Object (inside clusters):

    • name (string): Command name.
    • code (number): Command ID.
    • source (string): "client" or "server".
    • isEnabled (number): 1 if enabled, 0 otherwise.

  • endpoints Object:

    • endpointId (number): The endpoint number (e.g., 1).
    • endpointTypeName (string): References the name of the endpointType.
    • endpointTypeIndex (number): 0-based index of the referenced endpointType in the endpointTypes array.
    • profileId (number): Profile ID (typically 259 for Matter).

2. Matter IDL File Analysis (.matter)

Matter IDL (.matter) files are human-readable representations of the data model. They are typically generated from ZAP files.

2.1 List All Endpoints and Device Types

To quickly list all endpoints defined in the IDL and their device types:

rg -A 2 "endpoint [0-9]+" <path_to_matter_file>

2.2 Extract Endpoint Block and List Server Clusters

To extract the definition block of a specific endpoint (e.g., endpoint 1) and list all its server clusters:

sed -n '/endpoint[[:space:]]\+<endpoint_id>[[:space:]]*{/,/^}/p' <path_to_matter_file> | grep "server cluster"

Example for endpoint 1: sed -n '/endpoint 1 {/,/^}/p' ...

2.3 Extract Endpoint Block and List Binding (Client) Clusters

To extract the definition block of a specific endpoint (e.g., endpoint 1) and list all its binding (client) clusters:

sed -n '/endpoint[[:space:]]\+<endpoint_id>[[:space:]]*{/,/^}/p' <path_to_matter_file> | grep "binding cluster"

2.4 Detect Duplicate Cluster Definitions (Generator Bugs)

Sometimes, if a cluster is enabled as both client and server in the same app, the generator might bug out and generate duplicate top-level cluster definitions. Use this command to detect them:

awk '/^cluster [A-Za-z0-9_]+ = (0x[0-9A-Fa-f]+|[0-9]+) \{/ { count[$0]++; } END { for (line in count) { if (count[line] > 1) print count[line], line; } }' <path_to_matter_file>

This will output the count and the cluster definition line for any duplicates found.