Communicate with the Puck code

Posted on Thu 11th, October 2018

• #1

Ossama

How am i able to communicate with the puck say from node red.

at the moment the puck is advertising events when button is pressed.
how am i able to sent a response from node red, i.e. MQTT to tell the puck to run a function on my code
• #2

Gordon

Check this out: http://www.espruino.com/Puck.js+Node-RED#controlling-the-puck

You can have a custom Bluetooth service set up but this way just connects to the Puck's BLE UART and allows you to send JavaScript code to be executed.
• #3

Ossama

I have seen this, but i would like to execute a function within my code.
• #4

Gordon
Ok, all you do is:
- Write a function on Puck.js, maybe function myFunction() { ... }
- Then send an MQTT packet like "myFunction()\n" to /ble/write/de:vi:ce:ad:dr/nus/nus_tx
If you're interested in what is sent as a reply and don't want Espruino polluting the response with characters like > for the REPL, just prefix the line with char code 16:

"\x10myFunction()\n"

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