Handle signed integers in handle_cmd_heartbeat()

[pbock]

See issue #61, though I’ve not been able to test this as I’m not sure how integers below zero are encoded in heartbeat data and temperatures here are currently resolutely above zero.

[Arno-MA-73]

It's again bloody cold here, and my HA Toshiba integration has broken. Can I assist somehow in testing?

[hennikul]

I tried running this branch locally after having figured out what the problem was, and having tried to make my own patch. I can confirm that this patch works, and it's better than the fix I came up with.

Example debug of heartbeat that would have been wrong without the patch:
[2024-12-04 22:42:52,756] DEBUG toshiba_ac.device: [AC_83178279] AC heartbeat from AMQP: {'iTemp': 22, 'oTemp': -2, 'fcuTcTemp': 26, 'fcuTcjTemp': 127, 'fcuFanRpm': 51, 'cduTdTemp': 60, 'cduTsTemp': 0, 'cduTeTemp': 2, 'cduCompHz': 54, 'cduFanRpm': 83, 'cduPmvPulse': 113, 'cduIac': 0}

Without the patch, the oTemp would be 254.

[KaSroka]

Thanks for this contribution! Can you please update it as suggested below?

[pbock]

Ah, yeah, I wasn’t sure what else there was in the heartbeat, thanks for fixing the fix!