Akiyuki ODV hub messaging & firmware 4.0

[MichaelHarris196]

following the "Hub messaging has been moved" pop up I have been trying to update the Akiyuki Omnidirectional Vehicles [Configuration 04 which has 2 vehicles ] to use firmware 4.0 (they were tested by the designers with 3.6)

the first program run always fails as the download stalls at less than 100%
(tonight was at 27% )and I get this error message

GATT Error Unknown.

but if I re pair with the hub the second attempt downloads O.K.
to the program I have added :-
from pybricks.messaging import BLERadio
I have changed lines 467, 468 & 469 from
hub = TechnicHub(broadcast_channel=BROADCAST_CHANNEL)
else:
hub = TechnicHub(observe_channels=[BROADCAST_CHANNEL])
to
radio = BLERadio(broadcast_channel=BROADCAST_CHANNEL)
else:
radio = BLERadio(observe_channels=[BROADCAST_CHANNEL])

I have also changed line 112 from
hub.ble.broadcast(data)
to
radio.broadcast(data)
and lines 132 & 151 from
data = self.hub.ble.observe(self.observe_ch)
to
data = self.radio.observe(self.observe_ch)

however I got the following error message

NameError: 'hub' isn't defined

I then re-added at line 464
hub = TechnicHub()
as I believe there are functions within the hub module (e.g status light & battery etc ) that are being used.

now getting error message :-

Attribute error: 'BluetoothTimeSync' object has no attribute 'radio'

hopefully this is enough information
if the error message .png's upload O.K. I'll add one of the program files

[MichaelHarris196]

Program file for Vehicle 01
MH_ODV_Cfg04_01_MultiVehicle.py

[BertLindeman]

The Gatt unknown error I had was related to too many wifi and bluetooth noise near the hub and the pc.

I ran the vehicle program in the previous post without any problem.

You can have a look at items about GATT in pybricks issues