Bosch GLM 50-27 C support

[spongebyte]

This device does not advertise its name on Bluetooth.

It does not appear in Android's Bluetooth devices unless "Show Bluetooth devices without names" is enabled in Developer options. Then, Android refuses to pair to the device.

However using a Python script (reusing code from this repo and data from this post) I was able to connect to the device on my laptop, setting distance or bubble level mode, triggering measurement and receiving data. Reading distance measurement works, however I haven't figured out how to read the bubble level measurements.

I'll be happy to test CaveSurvey builds or provide more information. Thank you!

[spongebyte]

Hey, following up on your last comment on the other thread, #150 (comment). Is there anything I can do to try and help you make CaveSurvey available for this device?

Thank you.

[lz1asl]

The issue is that I don't have the same device and the one I have tries to always connect over BT Comm. I will write if I manage to get progress.

[spongebyte]

https://github.com/spongebyte/bosch/blob/main/playground.py

I can rotate between distance and angle modes, and I can trigger measurements.

The battery compartment of this device could fit an ESP32 + magnetometer sensor(s), and the whole assembly could be powered from a single 3V external source. The ESP32 would handle all interactions with the Bosch GLM 50 27 C.
And the Bosch GLM 50 27 C doesn't even need to be torn down at all.
I may wanna try and open mine to hunt for magnetic parts and try and replace them. But a first "scan" at the magnetometer suggests nothing too bad.

While this is diverging from your project here, I suppose I'll need to look into https://github.com/furbrain/CircuitPython_CaveBLE

[lz1asl]

Wow, this sounds like an interesting project.
Let's have a call and discuss it more?

[spongebyte]

Hey. Happy to chat in a few days. I can email you on the email address that shows up on your commit and we'll take it from there?

[spongebyte]

https://github.com/spongebyte/bosch

I've made some interesting progress. This is all Python for now, to make sure that my ideas are actually viable before adjusting all this to ESP32.

Happy to get your feedback, especially on the BLE payloads.