echo_bot.py

import logging
import argparse

from utils import setup_logging
from telegram.client import Telegram

"""
It answers "pong" if receives "ping"

Usage:
    python examples/send_message.py api_id api_hash phone
"""


if __name__ == "__main__":
    setup_logging(level=logging.INFO)

    parser = argparse.ArgumentParser()
    parser.add_argument("api_id", help="API id")  # https://my.telegram.org/apps
    parser.add_argument("api_hash", help="API hash")
    parser.add_argument("phone", help="Phone")
    args = parser.parse_args()

    tg = Telegram(
        api_id=args.api_id,
        api_hash=args.api_hash,
        phone=args.phone,
        database_encryption_key="changeme1234",
    )
    # you must call login method before others
    tg.login()

    def new_message_handler(update):
        message_content = update["message"]["content"]
        message_text = message_content.get("text", {}).get("text", "").lower()
        is_outgoing = update["message"]["is_outgoing"]

        if not is_outgoing and message_content["@type"] == "messageText" and message_text == "ping":
            chat_id = update["message"]["chat_id"]
            print(f"Ping has been received from {chat_id}")
            tg.send_message(
                chat_id=chat_id,
                text="pong",
            )

    tg.add_message_handler(new_message_handler)
    tg.idle()  # blocking waiting for CTRL+C