• Make sure you have curl. If you don't have it then install it or customize the NotifyPlaybulb vimscript function.
• nodejs.
• Compatible USB or Bluetooth device.
• Playbulb Candle lamp.

This repo uses noble to communicate with a compatible bluetooth device.

Once the server is running, it will try to connect with your Playbulb Candle peripheral named PLAYBULB (if your device has a different name then rename it with the Playbulb application or change the name in the code).

When the device has been successfully linked the script turns on an endpoint to allow the color change (defaults to localhost:8723/changeColor). This endpoint must be called using a POST request and the next 4 params are required:

• saturation: Color intensity (from 0 to 1)
• r: Red color (from 0 to 255)
• g: Green color (from 0 to 255)
• b: Blue color (from 0 to 255)

The rest of the work is easy to think how it works, each time the ale plugin sends an action, the number of erros/warning are counted for the current buffer and the color is changed using the previous endpoint.

Thats all folks :)

First, clone this repo and install all the dependencies:

$ https://github.com/josex2r/vim-ale-playbulb.git

$ cd vim-ale-playbulb && npm i

Run this command to start the server (if you want to see the log output use the DEBUG flag):

$ npm start

$ DEBUG=Express,Candle,Peripheral,Playbulb npm start

Check that you have correctly setup your vim linter with the ale plugin. Once you have the pluggin running add this piece of code to your .vimrc:

function! NotifyPlaybulb()
  # Get the `ale` error count (includes warnings)
  let l:counts = ale#statusline#Count(bufnr(''))
  let l:errors = l:counts.error + l:counts.style_error
  let l:warnings = l:counts.total - l:errors
  # Set default color (green)
  let l:color = "-d r=0 -d g=255 -d b=0"
  if warnings
    # Yellow
    let l:color = "-d r=255 -d g=100 -d b=0"
  elseif errors
    # Red
    let l:color = "-d r=255 -d g=0 -d b=0"
  endif
  # Send color to the server
  :silent exec "!curl -X POST " . l:color . " localhost:8723/changeColor"
endfunction

# This is the ale notification hook, it will call `NotifyPlaybulb` for each `ale` execution.
augroup VimAlePlaybulb
  autocmd!
  # Call our custom function.
  autocmd User ALELint call NotifyPlaybulb()
augroup END

You can enable this by going to Settings->Developer Options, then checking the box next to "Bluetooth HCI Snoop Log". Once this setting is activated, Android will save the packet capture to /sdcard/btsnoop_hci.log to be pulled and inspected.

Type the following in case /sdcard/ is not the right path on your particular device:

$ adb shell echo \$EXTERNAL_STORAGE

Finding the log file path:

$ adb shell "cat /etc/bluetooth/bt_stack.conf | grep FileName"

Retrieve the log

$ adb pull /sdcard/btsnoop_hci.log

Inspect it with Wireshark or another tool.

Protocol

The next image shows the packet that change the name of the lamp to "PLAYBULB", check the packet data:

• Address: 0x001c
• Service: 0xffff
• Value: 504c415942554c42 (PLAYBULB)