DTMF Butler

Dockerized Python serial modem attendant to pick up and dial a key.

Quickstart

1. Integrate the included docker-compose.yml

2. Map your serial modem device to /dev/ttyACM0

3. Set any environment: variables you need, or omit them to accept the defaults

Environment Variable	Default	Purpose
NOTIFY_ONLY	None	If present and not "" will only notify; will not dial in response to RING.
DIAL	6	The button to press after picking up, 0-9, * or #
TIMEOUT	3	Timeout (seconds) for modem to react to commands, serial read-write.
TELEGRAM_TOKEN	None	Your Telegram bot API token. Leave blank to disable.
TELEGRAM_USERS	None	Comma-separated list of Telegram IDs to message.

Complete Build

# Get the latest python base image
docker pull python:3-alpine

# Build a local image
docker build -t dtmf-butler .

# Run it
docker run -it --rm --user=root --device=/dev/ttyACM0 --name=dtmf-butler dtmf-butler

References, Thanks and Other Cool Projects

• Modem AT Command Set
• Serial Programming/Modems and AT Commands
• Voice modem command set
• Hayes command set
• "Serial Programming Guide for POSIX Operating Systems" 5th Edition, Michael R. Sweet, 1994
• USB Analog Modem with Raspberry Pi
• Send DTMF Tones with Raspberry Pi

Neat projects:

• https://github.com/stanzheng/home-rotary-doorbot