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# Research Engineering investigations, design notes, diagnostic methods, and historical update-chain studies live here. For measured outcomes, see [Test Results](../test-results/index.md); for current installation instructions, use the [documentation homepage](../index.md). ## Memory and storage - [Classic ESP32 image memory budget](esp32_memory_budget.md) - [Firmware memory checks](firmware_memory_budget.md) - [Companion contact caches](companion_contact_cache.md) ## Diagnostics and update-chain studies - [Linux Chromium Web Serial after pyserial](linux_chromium_web_serial_tty.md) - [nRF52 Companion Bluetooth diagnostic firmware](nrf52_bluetooth_debug.md) - [RAK3401 compact LoRa update chain](rak3401_mota_chain.md) - [RAK3401 1.16.07 to 1.17.1.7 with legacy bootloader](rak3401_1.17.1.7_legacy24.md)