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keptenkurk / BS440

Python code to talk to Medisana BS440 bluetooth enabled bathroom scale
MIT License
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Cannot connect to BS444 #92

Closed sgofferj closed 4 years ago

sgofferj commented 4 years ago

I have a BS444, IAN 331519, LOT R200218622. I can find it with hcitool lescan If I keep it on, I can connect to it with gattool.

However, BS440 times out while trying to connect to it.

Hardware: Pi 3B, internal BT interface.

Relevant log:

Fri, 09 Oct 2020 13:47:16 INFO     scan Starting BLE scan
Fri, 09 Oct 2020 13:47:26 INFO     scan Discovered A4:C1:38:CD:8A:6A (0131986A8ACD38C1A4)
Fri, 09 Oct 2020 13:47:26 INFO     scan Discovered 65:09:D2:D1:66:34 (None)
Fri, 09 Oct 2020 13:47:26 INFO     scan Discovered name of 65:09:D2:D1:66:34 as Living_room_TV
Fri, 09 Oct 2020 13:47:26 INFO     scan Found 2 BLE devices
Fri, 09 Oct 2020 13:47:26 INFO     connect Connecting to A4:C1:38:CD:8A:6A with timeout=8
Fri, 09 Oct 2020 13:47:34 ERROR    connect Timed out connecting to A4:C1:38:CD:8A:6A after 8 seconds.
Fri, 09 Oct 2020 13:47:34 INFO     connect Connecting to A4:C1:38:CD:8A:6A with timeout=8
Fri, 09 Oct 2020 13:47:42 ERROR    connect Timed out connecting to A4:C1:38:CD:8A:6A after 8 seconds.
Fri, 09 Oct 2020 13:47:42 INFO     connect Connecting to A4:C1:38:CD:8A:6A with timeout=8
sgofferj commented 4 years ago

Config:

# BS440.ini
# Initialization file for BS440.py
# Change to your preference
# Store this file in the working folder of BS440.py

# Scale properties
# Model: BS410, BS430, BS440, BS444
[Scale] 
ble_address: A4:C1:38:CD:8A:6A
device_name: 0131986A8ACD38C1A4
device_model: BS444

# Program behaviour
# Loglevel: debug | info | critical | error
[Program]
loglevel: debug
logfile: BS440.log
# Enable your plugins here, use the comma separated basename from the plugins/
# Example:
plugins: BS440mqtt
sgofferj commented 4 years ago

Screenshots from nrf connect ble scanner: Screenshot_20201009-141654.png Screenshot_20201009-141705.png Screenshot_20201009-141712.png Screenshot_20201009-141717.png

sgofferj commented 4 years ago

Trying some more debugging - learning gatttool at the same time...

gatttool -b A4:C1:38:CD:8A:6A -I
[A4:C1:38:CD:8A:6A][LE]> connect
Attempting to connect to A4:C1:38:CD:8A:6A
Connection successful
[A4:C1:38:CD:8A:6A][LE]> primary
attr handle: 0x0001, end grp handle: 0x0007 uuid: 00001800-0000-1000-8000-00805f9b34fb
attr handle: 0x0008, end grp handle: 0x0008 uuid: 00001801-0000-1000-8000-00805f9b34fb
attr handle: 0x0009, end grp handle: 0x0013 uuid: 0000180a-0000-1000-8000-00805f9b34fb
attr handle: 0x0014, end grp handle: 0x0021 uuid: 000078b2-0000-1000-8000-00805f9b34fb

Some values:

0x0180A

0x2a25 Serial number string: 6A8A 0x2a27 Hardware revision string: C1 0x2a26 Firmware revision sring: B.8 0x2a28 Manufacturer name string: Transtek 0x2a28 Software revision string: BLE_BF

sgofferj commented 4 years ago

Got it to work. My BS444 doesn't like to be connected with a random address. In line 242 of BS444.py I changed

addresstype = pygatt.BLEAddressType.random

to

addresstype = pygatt.BLEAddressType.public

With that it works perfectly.

keptenkurk commented 4 years ago

fixed in commit https://github.com/keptenkurk/BS440/commit/88d574077b6d3b09bf7d596683630d2437de59be