Enable >20 bytes on BLE about adafruit_nrf52_arduino HOT 5 CLOSED

SD132 v3.0.0 is required for negotiating MTU. Currently we only have S132 v2.0.1 with legacy bootloader

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Deferring this to a future release where we can update to the secure bootloader at the same time. 20 bytes per packet still gives about 4KB/s from local testing, which is better than the nRF51, and is consistent with user expectations.

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Bluefruit52 Throughput Example
Connected
Connected. Send a key and press enter to start test
Sending 61440 bytes ...
Sent 61440 bytes in 15.66 seconds.
Speed 
3.92 KB/s.

Connected. Send a key and press enter to start test

This is sending 60 bytes packets, just to have an idea of throughput. ~4KB/s is pretty decent for BLE UART (sending to Bluefruit LE Connect on OS X 10.11.6 in this case).

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@hathach , was this feature ever implemented ? I think it's still 20 bytes.

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was this problem solved ?

nvm. seems I forgot to add before bluefruit.begin() the call

Bluefruit.configPrphBandwidth(BANDWIDTH_MAX);

also the characteristic must be changed with

setMaxLen before begin()

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