Play audio while also POSTing to a URL on PicoW (or any CircuitPython device with native WiFi)

audio_plus_http_post.py

# audio_plus_http_post.py -- Play audio while also POSTing to a URL on PicoW
#                            (or any CircuitPython device with native WiFi)
# 16 Feb 2023 - @todbot / Tod Kurt, from @studioStephe(she/they) post on Adafruit Discord
#
# Notes:
# - Glitches on first POST, but subsequent POSTs are glitch free.
# - Could get around this by muting mixer.voice[0].volume on first POST
# - Or could get around by doing throw-away POST before starting audio
# - The glitching appears to be related to DNS lookups?
#
import os
import time, array, math
import board, microcontroller
import wifi, ssl, socketpool
import audiocore, audiomixer, audiopwmio
import adafruit_requests

print("Hello there")

wifi.radio.connect(os.getenv('CIRCUITPY_WIFI_SSID'), os.getenv('CIRCUITPY_WIFI_PASSWORD'))
print("Connected to WiFi")

pool = socketpool.SocketPool(wifi.radio)
requests = adafruit_requests.Session(pool, ssl.create_default_context())

post_url = "https://httpbin.org/post"
post_data = {
    "someparam1": "Some Important Value",
    "someparam2": "Hello_There",
    "someparam3": "OhNoData",
}

# create a sinewave array for use with RawSample
def make_sinewave(samplerate, freq):
    length = samplerate // freq
    sine_wave = array.array("h", [0] * length)
    for i in range(length):
        sine_wave[i] = int(( math.sin(math.pi * 2 * i / length)) * (2 ** 15 - 1))
    return sine_wave

SAMPLERATE=22050
sine440_buf = make_sinewave(SAMPLERATE, 440)
sine440_raw = audiocore.RawSample(sine440_buf, sample_rate=SAMPLERATE)
# or could use a WAV file
#sine440_wav = audiocore.WaveFile(open("/sine_440_aud.wav", "rb"))
sine440 = sine440_raw  # sine440_raw or sine440_wav

# set up audio output and mixer, attach mixer to audio output
audio = audiopwmio.PWMAudioOut(board.GP28)
mixer = audiomixer.Mixer(voice_count=1, sample_rate=SAMPLERATE, channel_count=1,
                         bits_per_sample=16, samples_signed=True)
audio.play(mixer)  # attach mixer to audio

# start playing wav file @ 1/2 volume
print("playing sinewave")
mixer.voice[0].level = .5
mixer.voice[0].play(sine440, loop=True)

while True:
    try:
        print("-" * 40)
        print("Posting to %s" % post_url)
        response = requests.request("POST", url=post_url, data=post_data)
        print("response: ", response.text)
        print("-" * 40)
        response.close()
        for i in range(10):
            print( 10-i,"..", end='')
            time.sleep(1)
        print()
    except Exception as e:
        print("Error:\n", str(e))
        print("Resetting microcontroller in 10 seconds")
        time.sleep(10)
        microcontroller.reset()