Nicehash API via MicroPython

# usage example
# obj = nicehash_request("/main/api/v2/accounting/accounts2","fiat=USD")

def nicehash_request(url, query=""):
    start = utime.ticks_ms()
    localtime = str('{0:f}'.format(get_time(False,True) * 1000)).split('.')[0] # epoch in ms
    nonce = str(uuid.uuid4())
    reqid = str(uuid.uuid4())
    message = bytearray(secrets['nicehash_key'],"utf-8") # api key
    message += b'\x00'
    message += bytearray(localtime,"utf-8")
    message += b'\x00'
    message += bytearray(nonce,"utf-8")
    message += b'\x00'
    message += b'\x00'
    message += bytearray(secrets['nicehash_org'],"utf-8") # api organization
    message += b'\x00'
    message += b'\x00'
    message += bytearray("GET","utf-8")
    message += b'\x00'
    message += bytearray(url,"utf-8")
    if query != "":
        message += b'\x00'
        message += bytearray(query,"utf-8")

    hmacs = hmac.HMAC(bytearray(secrets['nicehash_secret'],"utf-8"), message, hashlib.sha256) # api secret
    hashed_string = hmacs.hexdigest()
    auth = secrets['nicehash_key']+":"+hashed_string; # api key
    headers = {
        "X-Time": localtime,
        "X-Nonce": nonce,
        "X-Organization-ID": secrets['nicehash_org'], # api organization
        "X-Request-ID": reqid,
        "X-Auth": auth
    }
    response = urequests.get("https://api2.nicehash.com"+url+"?"+query, headers=headers)
    obj = json.loads(response.text)
    response.close()
    delta = utime.ticks_diff(utime.ticks_ms(), start)
    debug("Received response from Nicehash API (took "+str(delta)+"ms)")
    return obj