temperature_measurement: add FindClusterOnEndpoint and SetMeasuredVal… - #1816

temperature_measurement: add FindClusterOnEndpoint and SetMeasuredValue wrappers

The flow_measurement and relative_humidity_measurement integration.cpp files provide namespace-level FindClusterOnEndpoint() and SetMeasuredValue() wrappers so application code can write to codegen cluster storage directly (bypassing esp-matter attribute::update, which desyncs for non-writable attributes on codegen clusters — esp-matter storage vs codegen mMeasuredValue).

temperature_measurement was missing these wrappers. Add them following the flow_measurement pattern so apps using TemperatureMeasurement can use SetMeasuredValue() the same way.

Refs: pattern from clusters/flow_measurement/integration.cpp

Description

temperature_measurement was the only measurement cluster in
components/esp_matter/data_model_provider/clusters/ without
namespace-level FindClusterOnEndpoint() and SetMeasuredValue()
wrappers in its integration.cpp. flow_measurement and
relative_humidity_measurement already provide them.

For codegen-backed clusters, writing a non-writable attribute via
esp_matter::attribute::update() desyncs the two stores: it writes
the esp-matter storage, but ReadAttribute reads from the codegen
mMeasuredValue. Application code that wants to update
MeasuredValue must call the codegen SetMeasuredValue() method on
the cluster instance.

The cluster instance is looked up via FindClusterOnEndpoint(endpointId),
which exists in CodegenIntegration.h — but the matching
CodegenIntegration.cpp is excluded from the esp-matter build by
CMakeLists.txt (EXCLUDE_SRCS_LIST for Codegen*.cpp). The other
measurement clusters solve this by re-declaring the wrapper in
integration.cpp (the file actually compiled).

Without this wrapper, apps that call
TemperatureMeasurement::SetMeasuredValue() get a link error.

Changes

• components/esp_matter/data_model_provider/clusters/temperature_measurement/integration.cpp
  • Add FindClusterOnEndpoint(EndpointId) (matches flow_measurement pattern)
  • Add SetMeasuredValue(EndpointId, DataModel::Nullable<int16_t>) convenience wrapper

namespace chip::app::Clusters::TemperatureMeasurement {

TemperatureMeasurementCluster * FindClusterOnEndpoint(EndpointId endpointId)
{
    auto it = gServers.find(endpointId);
    if (it == gServers.end() || !it->second.IsConstructed()) {
        return nullptr;
    }
    return &it->second.Cluster();
}

CHIP_ERROR SetMeasuredValue(EndpointId endpointId, DataModel::Nullable<int16_t> measuredValue)
{
    auto * cluster = FindClusterOnEndpoint(endpointId);
    VerifyOrReturnError(cluster != nullptr, CHIP_ERROR_NOT_FOUND);
    return cluster->SetMeasuredValue(measuredValue);
}

} // namespace chip::app::Clusters::TemperatureMeasurement

Related

• Pattern source: components/esp_matter/data_model_provider/clusters/flow_measurement/integration.cpp
• Pattern source: components/esp_matter/data_model_provider/clusters/relative_humidity_measurement/integration.cpp
• Build exclusion: components/esp_matter/data_model_provider/CMakeLists.txt (EXCLUDE_SRCS_LIST for Codegen*.cpp)

Testing

• Pattern matches existing flow_measurement/integration.cpp and
  relative_humidity_measurement/integration.cpp exactly — no behavior
  change for apps that do not call the new wrappers.
• Build verified with an out-of-tree ESP-IDF + esp-matter example that calls
  TemperatureMeasurement::SetMeasuredValue(); without this wrapper the link
  step fails with an undefined reference to
  FindClusterOnEndpoint(EndpointId), with it the link succeeds and the
  attribute reads back the value set via the codegen path.

Checklist

Before submitting a Pull Request, please ensure the following:

• 🚨 This PR does not introduce breaking changes.
• All CI checks (GH Actions) pass.
• Documentation is updated as needed.
• Tests are updated or added as necessary.
• Code is well-commented, especially in complex areas.
• Git history is clean — commits are squashed to the minimum necessary.