Cannot connect to CX3120

[mo-seph]

I've got a CX3120, I can talk to it with aioairctl or the Philips App. If I try with this integration, I get "Cannot Connect to Device":

In the logs, I get:

Logger: custom_components.philips_airpurifier_coap.config_flow
Source: custom_components/philips_airpurifier_coap/config_flow.py:231
integration: Philips AirPurifier (with CoAP) ([documentation](https://github.com/kongo09/philips-airpurifier-coap), [issues](https://github.com/kongo09/philips-airpurifier-coap/issues))
First occurred: 10:41:20 (1 occurrences)
Last logged: 10:41:20

Failed to connect: [Errno 97] Address family not supported by protocol

I get the same if I use 'mxchip' as the device hostname (which works fine if I ping it).

It's pretty instant, so I don't think it's hitting the 30s timeout.

(and just for proof of connection, from the machine running HA:

> ping mxchip
PING mxchip.home (192.168.2.57) 56(84) bytes of data.
64 bytes from mxchip.home (192.168.2.57): icmp_seq=1 ttl=255 time=134 ms

)

[kongo09]

Can you please enable debug logging and see if you can identify more log entries?

I suspect that this is a problem with ipv6. Some users have reported difficulties before and even though the devices were reachable via ipv4 (as you demonstrate) the libraries still make use of ipv6 (for whatever reason). Can you check if that is disabled in your network, on your home assistant machine or maybe the containers you run HA in?

[mo-seph]

Confirmed - I enabled ipv6 on my HA machine, and now it works!

For info: when I enabled ipv6 initially, the HA integration still failed to connect, but it took longer to fail (2-3 seconds, rather than instantly failing). After I unplugged and re-plugged the heater, it started to work.

Thanks!

☕