Which kind of compression can be used to transfer data over BLE uart

Posted on Tue 15th, June 2021

• #1

MaBe

Hi have a 2k JSON and would like to send it compressed data over BLE uart.

On Espruino we have require("heatshrink").compress(data).

Does any one know a compatible way for nodejs to compress data that can be uncompressed in Espruino?
• #2

John in reply to @MaBe

Does https://github.com/gfwilliams/heatshrink-js help for that?

Alternatively, maybe https://github.com/systemmonkey42/node-heatshrink
• #3

Gordon

As @John says - I think the heatshrink-js build is what you want. It should be compatible with Node.js and it's the exact same algorithm and settings used for Espruino
• #4

MaBe

Thanks @John and @Gordon

Post a reply
- Bold
- Italics
- Link
- Image
- List
- Quote
- code
- Preview
Formatting Help

Don't worry about formatting, just type in the text and we'll take care of making sense of it. We will auto-convert links, and if you put asterisks around words we will make them bold.

Tips:

Create headers by underlining text with ==== or ----

To *italicise* text put one asterisk each side of the word

To **bold** text put two asterisks each side of the word

Embed images by entering:
![](https://www.google.co.uk/images/srpr/logo4w.png)
That's the hard one: exclamation, square brackets and then the URL to the image in brackets.

* Create lists by starting lines with asterisks

1. Create numbered lists by starting lines with a number and a dot

> Quote text by starting lines with >

Mention another user by @username

For syntax highlighting, surround the code block with three backticks:

```
Your code goes here
```
Just like Github, a blank line must precede a code block.

If you upload more than 5 files we will display all attachments as thumbnails.

For a full reference visit the Markdown syntax.