Telegram is a very versatile instant messaging software that can be used with the same phone number on different devices simultaneously.
In this tutorial we saw how to install it, and we tried to send text and media messages.
We have also seen that it is possible to set the Raspberry to send messages automatically.
In this tutorial we will ask Raspberry to take a specific action as a function of the received message, for example, we could send a text message with the word “photo” and Raspberry will sends us a photo of the apartment, or “lamp” to turn a lamp, or “open” to open the garage door.
Well, let's start
Step 1: Installation
Read this tutorial, we use this configuration as start point.
To intercept a new incoming message we create a file action.lua
“Lua is a powerful, fast, lightweight, embeddable scripting language.
Lua combines simple procedural syntax with powerful data description constructs based on associative arrays and extensible semantics. Lua is dynamically typed, runs by interpreting bytecode for a register-based virtual machine, and has automatic memory management with incremental garbage collection, making it ideal for configuration, scripting, and rapid prototyping.” From http://www.lua.org.
with this content
Save and exit, when incoming text message is “ping”, Telegram answers us with a text message containing “pong”.
move in tg
Try to send a message, if all goes well, Telegram answers only on “ping” and not “PING”, we should see something like this
Ok, let's do something more interesting.
create a new file camera.sh
with this content
save and exit, give it execution permissions
add this lines in function on_msg_receive
Step 2: Test
Now if you send a text message with “photo”, Raspberry answer with a photo
To enter additional commands simply change the file action.lua inserting a new if block , for example, we could activate a relay or ask the status of a sensor.
In the next tutorials will achieve some other example of use.
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For more detail: Raspberry remote control with Telegram