Write length of 495 byte array to device using web bluetooth api

Question

I am calling a python api endpoint which sends me the data to be written to the device. The data received is in encrypted format and I am converting the same to byte array using below

 let codePoints = [];

 for (let i = 0; i < encData.length; i++) {
   codePoints.push(encData.codePointAt(i));
 }

 const arraybufferdata = Uint8Array.from(codePoints);

I am trying to write this byte array using following code:

characteristic
.writeValueWithoutResponse(arraybufferdata)
.then(() => {
  console.log("successfully written to the device");
});

I am getting the below error:

I also tried writing by splitting the byte array into chunks as follows:

writeOut(data, start) {
 if (start >= data.byteLength) {
   console.log("successfully written to the device");
   return;
 }

this.mychar
  .writeValueWithoutResponse(data.slice(start, start + 256))
  .then(() => {
     this.writeOut(data, start + 256);
   });
}

writeBuffer(data, start) {
   this.writeOut(data, start);
}

this.writeBuffer(arraybufferdata, 0);

This is throwing error as well. What could be the issue? The device is not accepting the data to be written either.

UI framework: Angular 7 OS: Windows 10 Browser: Chrome 85

Please help!

Answer 1

Found the issue:

i was writing to the wrong characteristic! (facepalm)

It's working now!