Deep Dive w/Scott: ESP BLE Pairing & Bonding

Adafruit Industries

Join Scott as he starts working on ESP BLE pairing and bonding (aka initiating encrypted connections), demonstrates building CircuitPython with asyncio python scripts and answers questions. https://github.com/tannewt/circuitpython/tree/embedded-build https://github.com/tannewt/embedded Thanks to dcd for timecodes: 0:00 Getting Started 1:56 Hello - welcome to Deep Dive w/Scott 3:00 Adafruit Feather nRF25840 bluefruit feather example 3:09 We will talk about Bluetooth Low Energy today 4:47 Join #live-broadcast-chat on Discord at http://adafrui.it/discord 5:15 BLE vs Bluetooth "Classic" (older devices) 6:06 ESP32-S2-DevKitC-1 V1.o S2 SOLO N4R2 (bad example, no BLE support :-) ) 6:16 ESPS3 BLE + WiFi 7:43 LED Glasses nRF52840 8:42 Creating Servers and Dynamic Services - from two weeks ago 10:00 Pull Request to add ability to create services (e.g. HID services ) 10:45 Pairing & Bonding / services / characteristics (create a keyboard) 12:20 esp-matter protocol - hamslabs 13:35 PR: Add ESP BLE GATT server support #9222 13:46 also issue Add ESP BLE GATT server support #5926 14:41 Code review process inner workings 15:29 ESP32-H4 and ESP32-P4 annonuncement on espressif.com (not available yet) - but see ESP-IDF SDK 16:14 also added C2 support to circuitpython ( but it ran out of memory ) maybe only one of WiFi or BLE at a time 17:08 and C6 - no RMT neopixel support, but it does have BLE 19:45 using TinyUSB on devices with SPI but no USB 21:03 BLE_EXT_ADV ( extended advertising feature of BLE 5) 24:39 yesterdays ESP32 issue - better debugging by enabling better debug logging 25:40 pondering interrupt handlers and weak functions 26:27 Review files changed in PR9222 26:35 Trade-off OTA for BLE on new 4MB boards 28:00 adding -u to LDFLAGS to deal with weak symbols 29:18 Pairing and Bonding not supported yet 29:50 then maybe look at building CP with new build systems 31:29 Pairing and Bonding ... 33:35 ESP IDF stores bonding information in NVS partion 34:03 look on github circuitpython/tests/circuitpyton-manual for example code (but no BLE code) 34:14 adafruit/Adafruit_CircuitPython_BLE/examples/ble_hid_central.py ( all commented out) 36:13 adafruit/Adafruit_CircuitPython_BLE/examples/ble_current_time_service.py 36:37 iPhone pairing can deliver time 37:08 github espressif/esp-idf/examples/bluetooth/nimble blecent and bleprph 38:38 bleprph/tutorial bleprph_walkthrough.md 41:35 watch running CP and BLE and updating time 43:38 view example for bleprph/main/main.c code 44:14 CP repo ports/espressif/common-hal/_bleio/PacketBuffer.c 44:26 and ports/espressif/common-hal/_bleio/Connection. ( TODO:Implement this ) 46:58 using copilot to make printf debugging faster! 50:54 also Adapter.c 53:39 refer to online CP docs for _bleio 56:20 git switch ble_bonding 58:03 clangd feature for genertated tags in editor ( mentioned a few weeks ago )o 59:54 S3 WROOM-2 N32R8V 1:01:02 set up window for serial output capture and CP serial REPL 1:06:21 update code.py - start test / paired - decode connections 1:09:20 CP doesn't have audio over BLE 1:17:36 use chatgpt to convert C #defines to switch statement function 1:25:54 save the work in process and switch to embedded-build git repo 1:27;20 fetch and pip install the build tool 1:31:28 review the build code in build_circuitpython.py 1:34:44 build tool uses python asyncio to get parallelism 1:35:38 return to the perfetto.dev chart of the threads to see basic trace information 1:43:02 when you call an async function, it doen't even begin to execute it - it just wraps it so you can run it later1:44:20 discussion of zig build system 1:45:30 rerun the build - this time with some more parallel tasks 2:01:43 TODO: add memoization to the build system in the future 2:04:01 push the code tannewt embedded build and wrap up 2:11:10 have a great weekend Visit the Adafruit shop online - http://www.adafruit.com ----------------------------------------- LIVE CHAT IS HERE! http://adafru.it/discord Subscribe to Adafruit on YouTube: http://adafru.it/subscribe New tutorials on the Adafruit Learning System: http://learn.adafruit.com/ -----------------------------------------