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DJDavid98 / VRCOSC-BluetoothHeartrate

A Bluetooth Low Energy (BLE) heartrate sensor module for VRCOSC
GNU General Public License v3.0
8 stars 1 forks source link

Bluetooth doesn't reconnect on connection lost #3

Closed luvini closed 1 year ago

luvini commented 1 year ago

I have an Amazfit Bip (A1608) and noticed whenever it loses bluetooth connection to the computer, it doesn't automatically reconnect, it just stays disconnected and the heart rate shows up as 0

DJDavid98 commented 1 year ago

Please check the latest released version (v1.3.3) which contains some connection stability improvements as well.

luvini commented 1 year ago

Updated to v1.3.3

it read the first value, then keeps reconnecting and doesn't read any value anymore (shows up as 0)

2023-10-07 01:37:28 [verbose]: ----------------------------------------------------------
2023-10-07 01:37:28 [verbose]: terminal Log for luvini (LogLevel: Verbose)
2023-10-07 01:37:28 [verbose]: Running VRCOSC 2023.928.1.0 on .NET 6.0.22
2023-10-07 01:37:28 [verbose]: Environment: Windows (Microsoft Windows NT 10.0.22621.0), 12 cores
2023-10-07 01:37:28 [verbose]: ----------------------------------------------------------
2023-10-07 01:37:28 [verbose]: [Bluetooth Heartrate]: Starting
2023-10-07 01:37:28 [verbose]: [Bluetooth Heartrate]: Device MAC setting is not set, module will log discovered devices
2023-10-07 01:37:28 [verbose]: [Bluetooth Heartrate]: Scanning for devices
2023-10-07 01:37:28 [verbose]: [Bluetooth Heartrate]: Started
2023-10-07 01:37:29 [verbose]: [Bluetooth Heartrate]: Discovered device: ck_100157d7a4 (MAC: E9:2B:89:18:4A:88:00:00)
2023-10-07 01:37:29 [verbose]: [Bluetooth Heartrate]: Discovered device: ck_100157d7a4 (MAC: E9:2B:89:18:4A:88:00:00)
2023-10-07 01:37:31 [verbose]: [Bluetooth Heartrate]: Discovered device: Amazfit Bip Watch (MAC: 63:33:19:6C:24:CA:00:00)
2023-10-07 01:37:31 [verbose]: [Bluetooth Heartrate]: Discovered device: Amazfit Bip Watch (MAC: 63:33:19:6C:24:CA:00:00)
2023-10-07 01:37:38 [verbose]: [Bluetooth Heartrate]: Discovered device: Meta Quest 2 (MAC: 60:44:F2:1A:FE:59:00:00)
2023-10-07 01:37:38 [verbose]: [Bluetooth Heartrate]: Discovered device: Meta Quest 2 (MAC: 60:44:F2:1A:FE:59:00:00)
2023-10-07 01:37:45 [verbose]: [Bluetooth Heartrate]: Discovered device: Unknown (MAC: 2A:6F:42:5A:F5:70:00:00)
2023-10-07 01:37:50 [verbose]: [Bluetooth Heartrate]: Stopping
2023-10-07 01:37:50 [verbose]: [Bluetooth Heartrate]: Stopped scanning for devices (device found)
2023-10-07 01:37:50 [verbose]: [Bluetooth Heartrate]: Stopped
2023-10-07 01:37:58 [verbose]: [Bluetooth Heartrate]: Starting
2023-10-07 01:37:58 [verbose]: [Bluetooth Heartrate]: Scanning for devices
2023-10-07 01:37:58 [verbose]: [Bluetooth Heartrate]: Started
2023-10-07 01:38:03 [verbose]: [Bluetooth Heartrate]: Found device named Amazfit Bip Watch for MAC 63:33:19:6C:24:CA:00:00
2023-10-07 01:38:09 [verbose]: [Bluetooth Heartrate]: Found heartrate service
2023-10-07 01:38:09 [verbose]: [Bluetooth Heartrate]: Found heartrate measurement characteristic
2023-10-07 01:38:09 [verbose]: [Bluetooth Heartrate]: Registered heartrate characteristic value change handler
2023-10-07 01:38:09 [verbose]: [Bluetooth Heartrate]: Writing client characteristic configuration descriptor
2023-10-07 01:38:10 [verbose]: [Bluetooth Heartrate]: Connection successful
2023-10-07 01:38:10 [verbose]: [Bluetooth Heartrate]: Stopped scanning for devices (device found)
2023-10-07 01:38:38 [verbose]: [Bluetooth Heartrate]: Current device disconected
2023-10-07 01:38:38 [verbose]: [Bluetooth Heartrate]: Attempting reconnection...
2023-10-07 01:38:40 [verbose]: [Bluetooth Heartrate]: Scanning for devices
2023-10-07 01:38:49 [verbose]: [Bluetooth Heartrate]: Found device named Amazfit Bip Watch for MAC 63:33:19:6C:24:CA:00:00
2023-10-07 01:38:52 [verbose]: [Bluetooth Heartrate]: Found heartrate service
2023-10-07 01:38:52 [verbose]: [Bluetooth Heartrate]: Found heartrate measurement characteristic
2023-10-07 01:38:52 [verbose]: [Bluetooth Heartrate]: Registered heartrate characteristic value change handler
2023-10-07 01:38:52 [verbose]: [Bluetooth Heartrate]: Writing client characteristic configuration descriptor
2023-10-07 01:38:53 [verbose]: [Bluetooth Heartrate]: Connection successful
2023-10-07 01:38:53 [verbose]: [Bluetooth Heartrate]: Stopped scanning for devices (device found)
2023-10-07 01:39:20 [verbose]: [Bluetooth Heartrate]: Current device disconected
2023-10-07 01:39:20 [verbose]: [Bluetooth Heartrate]: Attempting reconnection...
2023-10-07 01:39:22 [verbose]: [Bluetooth Heartrate]: Scanning for devices
2023-10-07 01:39:23 [verbose]: [Bluetooth Heartrate]: Found device named Amazfit Bip Watch for MAC 63:33:19:6C:24:CA:00:00
2023-10-07 01:39:29 [verbose]: [Bluetooth Heartrate]: Found heartrate service
2023-10-07 01:39:29 [verbose]: [Bluetooth Heartrate]: Found heartrate measurement characteristic
2023-10-07 01:39:29 [verbose]: [Bluetooth Heartrate]: Registered heartrate characteristic value change handler
2023-10-07 01:39:29 [verbose]: [Bluetooth Heartrate]: Writing client characteristic configuration descriptor
2023-10-07 01:39:31 [verbose]: [Bluetooth Heartrate]: Connection successful
2023-10-07 01:39:31 [verbose]: [Bluetooth Heartrate]: Stopped scanning for devices (device found)
2023-10-07 01:39:58 [verbose]: [Bluetooth Heartrate]: Current device disconected
2023-10-07 01:39:58 [verbose]: [Bluetooth Heartrate]: Attempting reconnection...
2023-10-07 01:40:00 [verbose]: [Bluetooth Heartrate]: Scanning for devices
2023-10-07 01:40:02 [verbose]: [Bluetooth Heartrate]: Found device named Amazfit Bip Watch for MAC 63:33:19:6C:24:CA:00:00
2023-10-07 01:40:05 [verbose]: [Bluetooth Heartrate]: Found heartrate service
2023-10-07 01:40:05 [verbose]: [Bluetooth Heartrate]: Found heartrate measurement characteristic
2023-10-07 01:40:05 [verbose]: [Bluetooth Heartrate]: Registered heartrate characteristic value change handler
2023-10-07 01:40:05 [verbose]: [Bluetooth Heartrate]: Writing client characteristic configuration descriptor
2023-10-07 01:40:06 [verbose]: [Bluetooth Heartrate]: Stopping
2023-10-07 01:40:06 [verbose]: [Bluetooth Heartrate]: Stopped scanning for devices (device found)
2023-10-07 01:40:15 [verbose]: [Bluetooth Heartrate]: Stopped
2023-10-07 01:40:33 [verbose]: [Bluetooth Heartrate]: Starting
2023-10-07 01:40:33 [verbose]: [Bluetooth Heartrate]: Scanning for devices
2023-10-07 01:40:33 [verbose]: [Bluetooth Heartrate]: Started
2023-10-07 01:40:34 [verbose]: [Bluetooth Heartrate]: Found device named Amazfit Bip Watch for MAC 63:33:19:6C:24:CA:00:00
2023-10-07 01:40:39 [verbose]: [Bluetooth Heartrate]: Found heartrate service
2023-10-07 01:40:39 [verbose]: [Bluetooth Heartrate]: Found heartrate measurement characteristic
2023-10-07 01:40:39 [verbose]: [Bluetooth Heartrate]: Registered heartrate characteristic value change handler
2023-10-07 01:40:39 [verbose]: [Bluetooth Heartrate]: Writing client characteristic configuration descriptor
2023-10-07 01:40:40 [verbose]: [Bluetooth Heartrate]: Connection successful
2023-10-07 01:40:40 [verbose]: [Bluetooth Heartrate]: Stopped scanning for devices (device found)
2023-10-07 01:41:07 [verbose]: [Bluetooth Heartrate]: Current device disconected
2023-10-07 01:41:07 [verbose]: [Bluetooth Heartrate]: Attempting reconnection...
2023-10-07 01:41:09 [verbose]: [Bluetooth Heartrate]: Scanning for devices
2023-10-07 01:41:11 [verbose]: [Bluetooth Heartrate]: Found device named Amazfit Bip Watch for MAC 63:33:19:6C:24:CA:00:00
2023-10-07 01:41:16 [verbose]: [Bluetooth Heartrate]: Found heartrate service
2023-10-07 01:41:16 [verbose]: [Bluetooth Heartrate]: Found heartrate measurement characteristic
2023-10-07 01:41:16 [verbose]: [Bluetooth Heartrate]: Registered heartrate characteristic value change handler
2023-10-07 01:41:16 [verbose]: [Bluetooth Heartrate]: Writing client characteristic configuration descriptor
2023-10-07 01:41:17 [verbose]: [Bluetooth Heartrate]: Connection successful
2023-10-07 01:41:17 [verbose]: [Bluetooth Heartrate]: Stopped scanning for devices (device found)
2023-10-07 01:41:44 [verbose]: [Bluetooth Heartrate]: Current device disconected
2023-10-07 01:41:44 [verbose]: [Bluetooth Heartrate]: Attempting reconnection...
2023-10-07 01:41:46 [verbose]: [Bluetooth Heartrate]: Scanning for devices
2023-10-07 01:41:49 [verbose]: [Bluetooth Heartrate]: Found device named Amazfit Bip Watch for MAC 63:33:19:6C:24:CA:00:00
2023-10-07 01:41:54 [verbose]: [Bluetooth Heartrate]: Found heartrate service
2023-10-07 01:41:54 [verbose]: [Bluetooth Heartrate]: Found heartrate measurement characteristic
2023-10-07 01:41:54 [verbose]: [Bluetooth Heartrate]: Registered heartrate characteristic value change handler
2023-10-07 01:41:54 [verbose]: [Bluetooth Heartrate]: Writing client characteristic configuration descriptor
2023-10-07 01:41:56 [verbose]: [Bluetooth Heartrate]: Connection successful
2023-10-07 01:41:56 [verbose]: [Bluetooth Heartrate]: Stopped scanning for devices (device found)
2023-10-07 01:42:23 [verbose]: [Bluetooth Heartrate]: Current device disconected
2023-10-07 01:42:23 [verbose]: [Bluetooth Heartrate]: Attempting reconnection...
2023-10-07 01:42:25 [verbose]: [Bluetooth Heartrate]: Scanning for devices
2023-10-07 01:42:27 [verbose]: [Bluetooth Heartrate]: Found device named Amazfit Bip Watch for MAC 63:33:19:6C:24:CA:00:00
2023-10-07 01:42:30 [verbose]: [Bluetooth Heartrate]: Found heartrate service
2023-10-07 01:42:30 [verbose]: [Bluetooth Heartrate]: Found heartrate measurement characteristic
2023-10-07 01:42:30 [verbose]: [Bluetooth Heartrate]: Registered heartrate characteristic value change handler
2023-10-07 01:42:30 [verbose]: [Bluetooth Heartrate]: Writing client characteristic configuration descriptor
2023-10-07 01:42:32 [verbose]: [Bluetooth Heartrate]: Connection successful
2023-10-07 01:42:32 [verbose]: [Bluetooth Heartrate]: Stopped scanning for devices (device found)
DJDavid98 commented 1 year ago

I'm afraid either your computer or the watch itself is purposefully dropping the connection. I can imagine it's looking for some proprietary information to be sent to stay connected, but I have no clue about the reason why it keeps reconnecting. To me this seems like a hardware issue, the connection is supposed to stay open normally unless the device goes out of range or you disable Bluetooth on your machine.

-------- Original Message -------- On 7 Oct 2023, 03:45, luvini wrote:

Updated to v1.3.3

it read the first value, then keeps reconnecting and doesn't read any value anymore (shows up as 0)

2023-10-07 01:37:28 [verbose]: ---------------------------------------------------------- 2023-10-07 01:37:28 [verbose]: terminal Log for luvini (LogLevel: Verbose) 2023-10-07 01:37:28 [verbose]: Running VRCOSC 2023.928.1.0 on .NET 6.0.22 2023-10-07 01:37:28 [verbose]: Environment: Windows (Microsoft Windows NT 10.0.22621.0), 12 cores 2023-10-07 01:37:28 [verbose]: ---------------------------------------------------------- 2023-10-07 01:37:28 [verbose]: [Bluetooth Heartrate]: Starting 2023-10-07 01:37:28 [verbose]: [Bluetooth Heartrate]: Device MAC setting is not set, module will log discovered devices 2023-10-07 01:37:28 [verbose]: [Bluetooth Heartrate]: Scanning for devices 2023-10-07 01:37:28 [verbose]: [Bluetooth Heartrate]: Started 2023-10-07 01:37:29 [verbose]: [Bluetooth Heartrate]: Discovered device: ck_100157d7a4 (MAC: E9:2B:89:18:4A:88:00:00) 2023-10-07 01:37:29 [verbose]: [Bluetooth Heartrate]: Discovered device: ck_100157d7a4 (MAC: E9:2B:89:18:4A:88:00:00) 2023-10-07 01:37:31 [verbose]: [Bluetooth Heartrate]: Discovered device: Amazfit Bip Watch (MAC: 63:33:19:6C:24:CA:00:00) 2023-10-07 01:37:31 [verbose]: [Bluetooth Heartrate]: Discovered device: Amazfit Bip Watch (MAC: 63:33:19:6C:24:CA:00:00) 2023-10-07 01:37:38 [verbose]: [Bluetooth Heartrate]: Discovered device: Meta Quest 2 (MAC: 60:44:F2:1A:FE:59:00:00) 2023-10-07 01:37:38 [verbose]: [Bluetooth Heartrate]: Discovered device: Meta Quest 2 (MAC: 60:44:F2:1A:FE:59:00:00) 2023-10-07 01:37:45 [verbose]: [Bluetooth Heartrate]: Discovered device: Unknown (MAC: 2A:6F:42:5A:F5:70:00:00) 2023-10-07 01:37:50 [verbose]: [Bluetooth Heartrate]: Stopping 2023-10-07 01:37:50 [verbose]: [Bluetooth Heartrate]: Stopped scanning for devices (device found) 2023-10-07 01:37:50 [verbose]: [Bluetooth Heartrate]: Stopped 2023-10-07 01:37:58 [verbose]: [Bluetooth Heartrate]: Starting 2023-10-07 01:37:58 [verbose]: [Bluetooth Heartrate]: Scanning for devices 2023-10-07 01:37:58 [verbose]: [Bluetooth Heartrate]: Started 2023-10-07 01:38:03 [verbose]: [Bluetooth Heartrate]: Found device named Amazfit Bip Watch for MAC 63:33:19:6C:24:CA:00:00 2023-10-07 01:38:09 [verbose]: [Bluetooth Heartrate]: Found heartrate service 2023-10-07 01:38:09 [verbose]: [Bluetooth Heartrate]: Found heartrate measurement characteristic 2023-10-07 01:38:09 [verbose]: [Bluetooth Heartrate]: Registered heartrate characteristic value change handler 2023-10-07 01:38:09 [verbose]: [Bluetooth Heartrate]: Writing client characteristic configuration descriptor 2023-10-07 01:38:10 [verbose]: [Bluetooth Heartrate]: Connection successful 2023-10-07 01:38:10 [verbose]: [Bluetooth Heartrate]: Stopped scanning for devices (device found) 2023-10-07 01:38:38 [verbose]: [Bluetooth Heartrate]: Current device disconected 2023-10-07 01:38:38 [verbose]: [Bluetooth Heartrate]: Attempting reconnection... 2023-10-07 01:38:40 [verbose]: [Bluetooth Heartrate]: Scanning for devices 2023-10-07 01:38:49 [verbose]: [Bluetooth Heartrate]: Found device named Amazfit Bip Watch for MAC 63:33:19:6C:24:CA:00:00 2023-10-07 01:38:52 [verbose]: [Bluetooth Heartrate]: Found heartrate service 2023-10-07 01:38:52 [verbose]: [Bluetooth Heartrate]: Found heartrate measurement characteristic 2023-10-07 01:38:52 [verbose]: [Bluetooth Heartrate]: Registered heartrate characteristic value change handler 2023-10-07 01:38:52 [verbose]: [Bluetooth Heartrate]: Writing client characteristic configuration descriptor 2023-10-07 01:38:53 [verbose]: [Bluetooth Heartrate]: Connection successful 2023-10-07 01:38:53 [verbose]: [Bluetooth Heartrate]: Stopped scanning for devices (device found) 2023-10-07 01:39:20 [verbose]: [Bluetooth Heartrate]: Current device disconected 2023-10-07 01:39:20 [verbose]: [Bluetooth Heartrate]: Attempting reconnection... 2023-10-07 01:39:22 [verbose]: [Bluetooth Heartrate]: Scanning for devices 2023-10-07 01:39:23 [verbose]: [Bluetooth Heartrate]: Found device named Amazfit Bip Watch for MAC 63:33:19:6C:24:CA:00:00 2023-10-07 01:39:29 [verbose]: [Bluetooth Heartrate]: Found heartrate service 2023-10-07 01:39:29 [verbose]: [Bluetooth Heartrate]: Found heartrate measurement characteristic 2023-10-07 01:39:29 [verbose]: [Bluetooth Heartrate]: Registered heartrate characteristic value change handler 2023-10-07 01:39:29 [verbose]: [Bluetooth Heartrate]: Writing client characteristic configuration descriptor 2023-10-07 01:39:31 [verbose]: [Bluetooth Heartrate]: Connection successful 2023-10-07 01:39:31 [verbose]: [Bluetooth Heartrate]: Stopped scanning for devices (device found) 2023-10-07 01:39:58 [verbose]: [Bluetooth Heartrate]: Current device disconected 2023-10-07 01:39:58 [verbose]: [Bluetooth Heartrate]: Attempting reconnection... 2023-10-07 01:40:00 [verbose]: [Bluetooth Heartrate]: Scanning for devices 2023-10-07 01:40:02 [verbose]: [Bluetooth Heartrate]: Found device named Amazfit Bip Watch for MAC 63:33:19:6C:24:CA:00:00 2023-10-07 01:40:05 [verbose]: [Bluetooth Heartrate]: Found heartrate service 2023-10-07 01:40:05 [verbose]: [Bluetooth Heartrate]: Found heartrate measurement characteristic 2023-10-07 01:40:05 [verbose]: [Bluetooth Heartrate]: Registered heartrate characteristic value change handler 2023-10-07 01:40:05 [verbose]: [Bluetooth Heartrate]: Writing client characteristic configuration descriptor 2023-10-07 01:40:06 [verbose]: [Bluetooth Heartrate]: Stopping 2023-10-07 01:40:06 [verbose]: [Bluetooth Heartrate]: Stopped scanning for devices (device found) 2023-10-07 01:40:15 [verbose]: [Bluetooth Heartrate]: Stopped 2023-10-07 01:40:33 [verbose]: [Bluetooth Heartrate]: Starting 2023-10-07 01:40:33 [verbose]: [Bluetooth Heartrate]: Scanning for devices 2023-10-07 01:40:33 [verbose]: [Bluetooth Heartrate]: Started 2023-10-07 01:40:34 [verbose]: [Bluetooth Heartrate]: Found device named Amazfit Bip Watch for MAC 63:33:19:6C:24:CA:00:00 2023-10-07 01:40:39 [verbose]: [Bluetooth Heartrate]: Found heartrate service 2023-10-07 01:40:39 [verbose]: [Bluetooth Heartrate]: Found heartrate measurement characteristic 2023-10-07 01:40:39 [verbose]: [Bluetooth Heartrate]: Registered heartrate characteristic value change handler 2023-10-07 01:40:39 [verbose]: [Bluetooth Heartrate]: Writing client characteristic configuration descriptor 2023-10-07 01:40:40 [verbose]: [Bluetooth Heartrate]: Connection successful 2023-10-07 01:40:40 [verbose]: [Bluetooth Heartrate]: Stopped scanning for devices (device found) 2023-10-07 01:41:07 [verbose]: [Bluetooth Heartrate]: Current device disconected 2023-10-07 01:41:07 [verbose]: [Bluetooth Heartrate]: Attempting reconnection... 2023-10-07 01:41:09 [verbose]: [Bluetooth Heartrate]: Scanning for devices 2023-10-07 01:41:11 [verbose]: [Bluetooth Heartrate]: Found device named Amazfit Bip Watch for MAC 63:33:19:6C:24:CA:00:00 2023-10-07 01:41:16 [verbose]: [Bluetooth Heartrate]: Found heartrate service 2023-10-07 01:41:16 [verbose]: [Bluetooth Heartrate]: Found heartrate measurement characteristic 2023-10-07 01:41:16 [verbose]: [Bluetooth Heartrate]: Registered heartrate characteristic value change handler 2023-10-07 01:41:16 [verbose]: [Bluetooth Heartrate]: Writing client characteristic configuration descriptor 2023-10-07 01:41:17 [verbose]: [Bluetooth Heartrate]: Connection successful 2023-10-07 01:41:17 [verbose]: [Bluetooth Heartrate]: Stopped scanning for devices (device found) 2023-10-07 01:41:44 [verbose]: [Bluetooth Heartrate]: Current device disconected 2023-10-07 01:41:44 [verbose]: [Bluetooth Heartrate]: Attempting reconnection... 2023-10-07 01:41:46 [verbose]: [Bluetooth Heartrate]: Scanning for devices 2023-10-07 01:41:49 [verbose]: [Bluetooth Heartrate]: Found device named Amazfit Bip Watch for MAC 63:33:19:6C:24:CA:00:00 2023-10-07 01:41:54 [verbose]: [Bluetooth Heartrate]: Found heartrate service 2023-10-07 01:41:54 [verbose]: [Bluetooth Heartrate]: Found heartrate measurement characteristic 2023-10-07 01:41:54 [verbose]: [Bluetooth Heartrate]: Registered heartrate characteristic value change handler 2023-10-07 01:41:54 [verbose]: [Bluetooth Heartrate]: Writing client characteristic configuration descriptor 2023-10-07 01:41:56 [verbose]: [Bluetooth Heartrate]: Connection successful 2023-10-07 01:41:56 [verbose]: [Bluetooth Heartrate]: Stopped scanning for devices (device found) 2023-10-07 01:42:23 [verbose]: [Bluetooth Heartrate]: Current device disconected 2023-10-07 01:42:23 [verbose]: [Bluetooth Heartrate]: Attempting reconnection... 2023-10-07 01:42:25 [verbose]: [Bluetooth Heartrate]: Scanning for devices 2023-10-07 01:42:27 [verbose]: [Bluetooth Heartrate]: Found device named Amazfit Bip Watch for MAC 63:33:19:6C:24:CA:00:00 2023-10-07 01:42:30 [verbose]: [Bluetooth Heartrate]: Found heartrate service 2023-10-07 01:42:30 [verbose]: [Bluetooth Heartrate]: Found heartrate measurement characteristic 2023-10-07 01:42:30 [verbose]: [Bluetooth Heartrate]: Registered heartrate characteristic value change handler 2023-10-07 01:42:30 [verbose]: [Bluetooth Heartrate]: Writing client characteristic configuration descriptor 2023-10-07 01:42:32 [verbose]: [Bluetooth Heartrate]: Connection successful 2023-10-07 01:42:32 [verbose]: [Bluetooth Heartrate]: Stopped scanning for devices (device found)

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luvini commented 1 year ago

upgraded from a bluetooth 4.0 adapter to 5.3 and it still keeps disconnecting

luvini commented 1 year ago

It is possible it needs some proprietary information to stay connected, this other project for example sends an auth key: vrc-osc-miband-hrm but i wasn't able to get that one to work at all, even tough i got the correct auth key

I tried using Pulsoid and it seems to work with no problems if i have the Zepp life (oficial app for the watch) installed on the phone as well

Tested with a different phone without the Zepp life app and it kept reconnecting

It seems the watch will send the heartrate values when it gets connected and stop a few seconds after

You could either send the auth key to keep it connected, or just silently reconnect while keeping the last heartrate value in cache

if you want to use the auth key, this is how they get it: huami-token