RPi4 - Error: This item does not fit, needs 18 bytes but have only 17 left

[PhantomRay]

Hi there I have been always using this library in RPi 2 Zero with latest Raspberry Pi OS without any issues. However it always throws error when I run the same Peripheral sample code.

The error is like this

Error: This item does not fit, needs 18 bytes but have only 17 left
    at addData (/home/pi/dev/blue-test/node_modules/ble-host/lib/advertising-data-builder.js:30:10)
    at AdvertisingDataBuilder.add128BitServiceUUIDs (/home/pi/dev/blue-test/node_modules/ble-host/lib/advertising-data-builder.js:66:3)
    at /home/pi/dev/blue-test/bt.js:68:10
    at /home/pi/dev/blue-test/node_modules/ble-host/lib/ble-manager.js:2356:17
    at cont (/home/pi/dev/blue-test/node_modules/ble-host/lib/ble-manager.js:491:5)
    at /home/pi/dev/blue-test/node_modules/ble-host/lib/ble-manager.js:478:6
    at Object.callback (/home/pi/dev/blue-test/node_modules/ble-host/lib/internal/adapter.js:616:5)
    at HciSocket.onData (/home/pi/dev/blue-test/node_modules/ble-host/lib/internal/adapter.js:1174:10)
    at HciSocket.emit (node:events:526:28)
    at /home/pi/dev/blue-test/node_modules/hci-socket/lib/hci-socket.js:105:9

Am I missing anything?

[PhantomRay]

I think it's some kind of environment issue, because if I put RPi 2's microSD card into RPi 4, everything works as expected.

However I cannot figure out why.

[Emill]

How does your code look like where you call the advertisement builder?

[PhantomRay]

It's exactly a copy and paste from README page.

[PhantomRay]

I might be wrong. I will get back to you.

[PhantomRay]

I think somehow I messed up the code.

Sorry for the false alarm.

Have a wonderful Easter!

[PhantomRay]

Hi @Emill I have found out the issue. I was using "MyDevice4" as device name and then the error pops up. Shorter name will be fine.

Any suggestions on device name length? I thought it could be longer.

[alancnet]

The final legacy advertisement packet can be no longer that 31 bytes. So it wasn't just the name, it was a combination of everything else.