async def async_func(app):
    try:
        await app.start()
        await app.send_message(CHAT_ID, "/start")
        await app.stop()
    except Exception as e:
        print(e)

async def main():
        my_apps = []
        for x in i:
            k = json.loads(x)
            my_apps.append(loop.create_task(
                async_func(Client(k['session_str'], k['api_id'], k['api_hash'], app_version=k['app_version'],
                                  system_version=k['system_version'], lang_code=k['lang_code'],
                                  device_model=k['device_model']))))
        await asyncio.sleep(3)
        await asyncio.wait(my_apps)