Myujth

I'm using an Linux embedded device that can only run QML/Javascript items. There are no compilers available, no Python, no curl, no Node.js, no package managers... But I can write bash scripts.

I need to send asynchronous data from a bash script to the QML/JS objects.
Until now I did the opposite: the JS reads a file created from the bash script:

Bash script:

#!/bin/bash
stty -F /dev/ttyS1 115200 -echo
echo "Receiver is listening..."

file="/dev/ttyS1"

while read -r line; do
 echo "$line"
 target=$line:0:1
 echo "$target"
 if [ "$target" = "C" ]; then
 echo "$line#?" > /tmp/file1
 elif [ "$target" = "D" ]; then
 echo "$line#?" > /tmp/file2
 fi
done < "$file"

QML/JS:

function request(url, callback) 
 var xhr = new XMLHttpRequest();
 var timer = Qt.createQmlObject("import QtQuick 1.1; Timer interval: 500; repeat: false; running: true;", root, "TimerTimeout");

 timer.triggered.connect(function()
 xhr.abort();
 _timeout = true
 );

 xhr.onreadystatechange = function() 
 if (xhr.readyState === 4) 
 timer.running = false;
 timer.destroy();
 _timeout = false
 callback(xhr.responseText);
 
 ;

 xhr.open("GET", url, true);
 xhr.send();

but it's not useful for asynchronous data, because due the polling time I can lose something or get duplicate of already read stuff.

I'm looking for another way to send bytes from a bash script to the QML/JS items. I'm able to send UDP packets from bash:

echo "Hello world!" > /dev/udp/192.168.1.10/6188

but I don't know how to receive them in JS.
Are there other ways to achieve the same goal?