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JsBergbau / MiTemperature2

Read the values of the Xiaomi Mi Bluetooth Temperature sensor 2 including custom encrypted format.
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Enable BT5 Long Range #139

Open Poil opened 1 year ago

Poil commented 1 year ago

Hi,

Is it possible to enable BT5 PHY/LE ? I think we have to patch bluetooth_utils.py but I'm not sure ?

It looks like we need to configure the adaptator to

hcitool -i hciX cmd 08 31 03 05 05
# or 
hcitool -i hciX cmd 08 31 03 07 07
< HCI Command: LE Set Default PHY (0x08|0x0031) plen 3                                                                                                                                                                                                                                                   #17 [hci1] 6.052660
        All PHYs preference: 0x03
          No TX PHY preference
          No RX PHY preference
        TX PHYs preference: 0x05
          LE 1M
          LE Coded
        RX PHYs preference: 0x05
          LE 1M
          LE Coded
> HCI Event: Command Complete (0x0e) plen 4                                                                                                                                                                                                                                                              #18 [hci1] 6.053720
      LE Set Default PHY (0x08|0x0031) ncmd 2
        Status: Success (0x00)

ref. https://github.com/custom-components/ble_monitor/issues/1135 & https://github.com/Bluetooth-Devices/bthome-ble/issues/45

Requirements

# cat /etc/systemd/system/bluetooth.service.d/override.conf 
[Service]
Type=dbus
BusName=org.bluez
ExecStart=
ExecStart=/usr/lib/bluetooth/bluetoothd --experimental

# bluetoothd  --version
5.66

Best regards

JsBergbau commented 1 year ago

That looks like a systemwide change. I'm not sure whether this should be done at all in MiTemperature2. What is your goal? Since we are only passive listening, it shouldn't matter whether Bluetooth5 is enabled or not.

Poil commented 1 year ago

BT5 is OK, but not I'm unable to find any sensor when I enable Long Range on firmware 4.2 (https://github.com/pvvx/ATC_MiThermometer) I thank you override some adaptator configuration, but perhaps I'm wrong

JsBergbau commented 1 year ago

Thanks for the link. Now I understand.

Raspberry PIs seem not to support BT5 Long range mode https://forums.raspberrypi.com/viewtopic.php?t=244386#p1523836

So the only thing they seem to have done is a new qualification for the latest version, and not actually implemented any of the new optional features such as 2 Mbit/s PHY, Long Range, Extended advertisements etc.

So when trying this with raspberry PI, you won't see the sensors, even with "BT5" enabled.

Poil commented 1 year ago

I'm trying on a X86 machine with a BT5.1 USB dongle :) With btmon I don't see a change that disable PHY/LE mode when running your script, I will try with another BT dongle. My idea is to remove my 3x Pi Zero W that collect my Misensors to use only the X86 server that centralized the collect today