Make UARTService characteristics be at least as large as max MTU-3 #203
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User Thinman in discord tested and it fixes their problem. |
tannewt
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Updating https://github.com/adafruit/Adafruit_CircuitPython_BLE to 10.0.9 from 10.0.8: > Merge pull request adafruit/Adafruit_CircuitPython_BLE#203 from dhalbert/nus-buffers-at-least-mtu > Merge pull request adafruit/Adafruit_CircuitPython_BLE#206 from dhalbert/pnp_id-defaults > Merge pull request adafruit/Adafruit_CircuitPython_BLE#204 from adafruit/dhalbert-patch-1 > Merge pull request adafruit/Adafruit_CircuitPython_BLE#202 from ktnyt/device-info-pnp-id Updating https://github.com/adafruit/Adafruit_CircuitPython_Bundle/circuitpython_library_list.md to NA from NA: > Added the following libraries: Adafruit_CircuitPython_USB_Host_Mass_Storage, Adafruit_CircuitPython_USB_Host_MIDI Updating https://github.com/adafruit/Adafruit_CircuitPython_Bundle/circuitpython_library_list.md to NA from NA: > Updated download stats for the libraries
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Fixes #94.
Nordic UART Service clients expect that they will be able to send MTU-3 bytes all at once, in a single write. The current code was expecting no more than 20-byte writes.
Currently the maximum MTU-3 used by all CircuitPython ports is 512-3 (which is wrong, it should be 512). Change the
max_lengthfor the characteristic to be 512, and also enlarge the PacketBuffer correspondingly.Tested with UART sends from Adafruit Bluefruit Connect app and nRF Toolbox on iOS on nRF52840 and Metro ESP32-S3. Also tested for regression with an nRF52840 uART client.