Keeps a Chromecast from going into standby

chromecast_keepawake.py

#!/usr/bin/python

'''

Sends an ADB command to a Chromecast (or whatever) to keep it from going
into standby after 4 hours. Currently does that by simulating a
screen touch every 5 minutes with the command "input tap -20 0". That
simulates a screen touch off screen so it doesn't affect apps (if on screen
YouTube will get affected for example)

Install adb_shell with pip install adb-shell
I actually used the version with USB support, but I don't think that's
needed. That installs with pip install adb-shell[usb]

Need to set the path to the adbkey_fname below (search for "adbkey_fname")
You'll also need to set the ip address of your chromecast (and enable
developer mode on the Chromecast and approve the connection the first
time).

To do: test cycling power on the Chromecast while loop is running, might need to
reconnect.


-wrybread@gmail.com, 10/1/2023

'''



import os, sys, time
from datetime import datetime

# pip install adb-shell[usb]
from adb_shell.adb_device import AdbDeviceTcp, AdbDeviceUsb
from adb_shell.auth.sign_pythonrsa import PythonRSASigner
from adb_shell.auth.keygen import keygen



# Where would you like to store your ADB key?
adbkey_fname = "c:\\temp\\adb_key"

# What's the ip address of your Chromecast or whatever device?
ip_address = "192.168.1.104"




# Create the public and private keys if they don't exist
if not os.path.exists(adbkey_fname):
    try: os.makedirs(os.path.dirname(adbkey_fname))
    except: pass
    print ("Creating the key...")
    keygen(adbkey_fname)

# Load the public and private keys
with open(adbkey_fname) as f:
    priv = f.read()
with open(adbkey_fname + '.pub') as f:
     pub = f.read()
signer = PythonRSASigner(pub, priv)

# Connect
while True:
    try:
        print ("Connecting to %s" % ip_address)
        device1 = AdbDeviceTcp(ip_address, 5555, default_transport_timeout_s=9.)
        device1.connect(rsa_keys=[signer], auth_timeout_s=0.1)
        print ("Success!")
        break
    except Exception as e:
        print ("Couldn't connect: %s" % e)
        time.sleep(1)
        
# Simulate a screen touch off screen in a loop
# To do: test cycling power on Chromecast while loop is running, might need to reconnect
command = "input tap -20 0"
while True:
    dt = datetime.now()
    timestamp = dt.strftime('%Y-%m-%d %H:%M:%S')
    print ("%s: Running ADB command '%s'" % (timestamp, command) )
    response = device1.shell(command)
    #print (response)
    time.sleep(300)