casambi-bt-revamped 0.4.1

Forked Casambi Bluetooth client library with switch event support, use original if no special need. https://github.com/lkempf/casambi-bt

Casambi Bluetooth Revamped - Python library for Casambi networks

This is a customized fork of the original casambi-bt library with additional features and should only be used for special needs:

• Switch event support - Receive button press/release/hold events from Casambi switches (wired + wireless)
• Improved relay status handling - Better support for relay units
• Classic protocol (experimental) - Basic unit control for Classic (legacy) firmware networks
• Bug fixes and improvements - Various fixes based on real-world usage

This library provides a bluetooth interface to Casambi-based lights. It is not associated with Casambi.

For Home Assistant integration using this library, see casambi-bt-hass.

Getting started

This library is available on PyPi:

pip install casambi-bt-revamped

Have a look at demo.py for a small example.

Switch Event Support

This library supports receiving physical switch events as a decoded stream of INVOCATION frames (ground truth from the official Android app).

Event types you can expect:

• button_press
• button_release
• button_hold
• button_release_after_hold
• input_event (raw NotifyInput frame that may accompany presses/holds; useful for diagnostics and some wired devices)

from CasambiBt import Casambi

def handle_switch_event(event_data):
    print(
        "Switch event:",
        {
            "unit_id": event_data.get("unit_id"),
            "button": event_data.get("button"),
            "event": event_data.get("event"),
            # INVOCATION metadata (useful for debugging/correlation)
            "event_id": event_data.get("event_id"),
            "opcode": event_data.get("opcode"),
            "target_type": event_data.get("target_type"),
            "origin": event_data.get("origin"),
            "age": event_data.get("age"),
            # NotifyInput fields (target_type=0x12)
            "input_code": event_data.get("input_code"),
            "input_channel": event_data.get("input_channel"),
            "input_value16": event_data.get("input_value16"),
            "input_mapped_event": event_data.get("input_mapped_event"),
        },
    )

casa = Casambi()
# ... connect to network ...

# Register switch event handler
casa.registerSwitchEventHandler(handle_switch_event)

# Events will be received when buttons are pressed/released

Notes:

• Wireless (battery) switches typically send a "button stream" (target_type 0x06) for press/release, and a NotifyInput stream (target_type 0x12) for hold/release-after-hold.
• Wired switches often only send NotifyInput (target_type 0x12), so input_code is mapped into button_press/button_release/... when appropriate.
• The library suppresses same-state retransmits at the protocol layer (edge detection), so Home Assistant-style time-window deduplication should generally not be necessary.

For the parsing details and field layout, see doc/PROTOCOL_PARSING.md.

Classic (Legacy Firmware) Support (Experimental)

This library can also connect to Classic Casambi networks and send unit control commands.

How it works (ground truth: the bundled Android app sources):

• Classic devices expose a CMAC-signed data channel (ca51/ca52) or a "Classic conformant" signed channel on the EVO UUID.
• The cloud network JSON exposes visitorKey / managerKey (hex strings) instead of an EVO keyStore.
• Commands are signed with AES-CMAC and sent as Classic "command records" (see doc/PROTOCOL_PARSING.md).

Environment flags:

• CASAMBI_BT_DISABLE_CLASSIC=1 to refuse Classic connections (fail fast)
• CASAMBI_BT_CLASSIC_USE_MANAGER=1 to sign with the 16-byte manager signature (default is visitor/4-byte prefix)
• CASAMBI_BT_LOG_RAW_NOTIFIES=1 to enable very verbose per-notify hexdumps (mainly for Classic debugging)

MacOS

MacOS does not expose the Bluetooth MAC address via their official API, if you're running this library on MacOS, it will use an undocumented IOBluetooth API to get the MAC Address. Without the real MAC address the integration with Casambi will not work. If you're running into problems fetching the MAC address on MacOS, try it on a Raspberry Pi.

Casambi network setup

If you have problems connecting to the network please check that your network is configured appropriately before creating an issue. The network I test this with uses the Evoultion firmware and is configured as follows (screenshots are for the iOS app but the Android app should look very similar):

Development / Offline Testing

This repo includes log-driven unit tests for switch parsing:

cd casambi-bt
python -m unittest -v