Bluetooth speed testing

[siliconwitch]

Trying different connection settings to get better Bluetooth throughput. Following this article.

Additional info on this Nordic forum post

Apple accessory design guidelines here. Bluetooth connection info is found on page 193.

Test script:

import bluetooth
import time
import urandom


def choices(rng, k=1):
    l = []
    for _ in range(k):
        l.append(urandom.choice(rng))
    return l


while True:
    if bluetooth.connected():
        mtu = bluetooth.max_length()
        start = time.ticks_ms()
        i = 0
        while i < 20:
            try:
                bluetooth.send(bytearray(choices(range(0, 256), k=mtu)))
                i += 1
            except OSError:
                pass
        end = time.ticks_ms()
        diff = time.ticks_diff(end, start)
        sent = (i - 1) * mtu
        print(f"Sent {sent} bytes at {round(sent/diff, 2)}kB/s")