Hannes (hannesb) posted a working Matter temperature sensor build on the Seeed Studio forum, running on the XIAO nRF54LM20A. He started from the nRF Connect SDK Matter temperature template, added a BME sensor for temperature and humidity readings, and took supply current measurements. The source code is up on GitHub.
SDK 3.4.1 did not produce running code for him. He points at the deprecated Partition Manager as the main obstacle.
A forum reply digs into the static partition file. The app slot was shrunk from 0x125800 to 0x10D800 to fit everything in internal flash, but mcuboot_primary was left at its old size, so the primary and secondary slots overlap. The suggested fix is to move mcuboot_secondary to the board’s on-board 8 MB PY25Q64HA SPI NOR flash. That frees about 768 KB of internal RRAM and allows a symmetric primary slot near 1.8 MB with no DFU decompression at runtime. The reply also suggests raising settings_storage from 48 KB to 64 KB for setups joining more than one Matter fabric, such as Apple Home and Home Assistant at the same time.
See more at forum.seeedstudio.com and content on GitHub.
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