esp-idf/tools/test_apps/protocols/mqtt/build_test

Supported Targets	ESP32	ESP32-C2	ESP32-C3	ESP32-C5	ESP32-C6	ESP32-H2	ESP32-P4	ESP32-S2	ESP32-S3

Build only test for C++

This test app ensures that calling all mqtt-client API could be called from C++