Can the Puck recieve an Eddystone-URL broadcast?

You are reading a single comment by @Gordon and its replies. Click here to read the full conversation.

•

Gordon

First, I'd say it looks like you might have an out of date Puck.js firmware? It'd be worth updating to 1v92

But I don't think that is your problem. Error 9 is 'invalid length' (which is reported as text on 1v92 firmware). It's actually saying that the data you're trying to send has the length field set wrong.

Try changing: 0x13, // Length of Service Data

to: 0x14, // Length of Service Data

It should be the number of bytes that are after that byte.

Also, do you know that if you want to use eddystone, there's a library which will do it all for you? http://www.espruino.com/Puck.js+Eddystone

•

intern in reply to @Gordon
Hi, you are correct that my Puck is now still on 1v88. I didn't update it because I have some other projects in progress and I don't want to potentially affect them through updating.

I changed 0x13 to 0x14 then add one more character to the message and it worked! Now I found that the maximum value is 0x1A and the entire message is now 31 bytes just as you mentioned.

Working: (31 bytes total)
```
NRF.setAdvertising([0x03,  // Length of Service List
  0x03,  // Param: Service List
  0xAA, 0xFE,  // Eddystone ID
  0x1A,  // Length of Service Data
  0x16,  // Service Data
  0xAA, 0xFE, // Eddystone ID
  0x10,  // Frame type: URL
  0xF8, // Power
  0x03, // https://
  '1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G','H','I','J','K'],
    {interval:100});
```
Any further extension will result in BLE Error Code 9 but that is to be expected, I think.

I am aware that the Eddystone library exists, but I am using this manual way to verify if the message can be maximum 31 bytes long.

Now I am able to use NRF.findDevices on the receiving beacon to read the information from other Bluetooth beacons nearby. I am looking into a way to filter out everything except the Puck's broadcast. One way I suspect this can be done is using the services key in the devices object as the broadcasting message has the feaa value. Though I have zero experience in js so I think this will take a while.
```
BluetoothDevice {
  "id": "e3:55:93:0b:72:1d random",
  "rssi": -66,
  "services": [
    "feaa"
   ],
  "data": new ArrayBuffer([3, 3, 170, 254, 26, 22, 170, 254, 16, 248, 3, 49, 50, 51, 52, 53, 54, 55, 56, 57, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75])
 }
```
Many thanks for you help.

Can the Puck recieve an Eddystone-URL broadcast?

About

Espruino