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Send messages and plots from Matlab to a secure Telegram channel

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Herald

Introduction

Concept of Telegram bots

A bot is a Telegram entity which can send messages to a channel and manage them. Tools like herald use the Telegram Bot API to interact with channels through bots.

Creating a custom bot

Create a custom bot by starting a conversation with @BotFather and provide the bot's API token as described above.

Installation

Make sure the heraldCore.m file and the private folder are in the current workspace or have been added to PATH. It is recommended to use a wrapper around the heraldCore() function (see below).

On the system side, 'cURL' needs to installed. This is included in linux, macOS and Windows 10. If cURL is not available, please install from this site. For Windows, the Chocolatey method is recommended.

Herald works with Matlab R2007a and newer. Older versions may work but have not yet been tested.

Syntax

The following documentation assumes you created a wrapper named herald.m.

Sending a message or a plot

herald(text) sends the message text to the channel.

herald(figHandle) sends the figure with handle figHandle as a PNG directly to the channel.

msg = herald(...) returns information about the message or picture sent in the struct msg.

Deleting a message

herald([], msg) will delete the message msg. This can be text or a picture.

Updating a message

herald(text, msg) updates the message msg with the new content text.

Note: updating an image is currently not supported. Consider deleting the picture and sending a new one.

Notes on using Herald

How to obtain a chatId (using direct chat)

After starting a conversation with your custom bot, forward a message inside that conversation to @get_id_bot and the chatId will be returned to you.

How to obtain a chatId (using channels)

The chatId is obtained from forwarding a random message inside the dedicated channel to @get_id_bot. This channel should have your custom bot as an administrator in order to function.

Note about wrappers

It is recommended to build a wrapper around heraldCore() similar to the included heraldWrapper(). The wrapper will forward all requests "as is" to the core herald function along with the chat id (see above).

If you choose to not use a wrapper and instead interact with the heraldCore() function directly, two additional arguments must be provided as such: heraldCore(botToken, chatId, ...). Detailed instructions can be obtained by running help heraldCore in Matlab.

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Send messages and plots from Matlab to a secure Telegram channel

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