[Bug]: FT device not shown in Homekit
### Describe the bug

I'm a Nest FT user, trying to use the plugin for a nest doorbell.

Previously I got:

Error fetching session: ECONNABORTED

After switching to child bridge, no error is flagging, but I don't see the camera in HomeKit when adding the new accessory. 

### Debug Output

[8/24/2021, 1:28:21 PM] [Nest-cam] Initializing Nest-cam platform...
[8/24/2021, 1:28:21 PM] [Nest-cam] Using motionDetection from config: true
[8/24/2021, 1:28:21 PM] [Nest-cam] Using doorbellAlerts from config: true
[8/24/2021, 1:28:21 PM] [Nest-cam] Using doorbellSwitch from config: true
[8/24/2021, 1:28:21 PM] [Nest-cam] Using streamingSwitch from config: true
[8/24/2021, 1:28:21 PM] [Nest-cam] Using chimeSwitch from config: true
[8/24/2021, 1:28:21 PM] [Nest-cam] Using announcementsSwitch from config: true
[8/24/2021, 1:28:21 PM] [Nest-cam] Using audioSwitch from config: true
[8/24/2021, 1:28:21 PM] [Nest-cam] Defaulting structures to []
[8/24/2021, 1:28:21 PM] [Nest-cam] Defaulting cameras to []
[8/24/2021, 1:28:21 PM] [Nest-cam] Authenticating via Google refresh token.
[8/24/2021, 1:28:34 PM] [Nest-cam] Error fetching session: ECONNABORTED


Switching to child bridge:

[8/24/2021, 1:31:04 PM] Registering platform 'homebridge-nest-cam.Nest-cam'
[8/24/2021, 1:31:07 PM] [Nest-cam] Initializing Nest-cam platform...
[8/24/2021, 1:31:07 PM] [Nest-cam] Initializing child bridge 0E:A6:45:AC:32:5B
[8/24/2021, 1:31:08 PM] Registering platform 'homebridge-nest-cam.Nest-cam'
[8/24/2021, 1:38:09 PM] Registering platform 'homebridge-nest-cam.Nest-cam'
[8/24/2021, 1:38:11 PM] [Nest-cam] Initializing Nest-cam platform...
[8/24/2021, 1:38:11 PM] [Nest-cam] Initializing child bridge 0E:A6:45:AC:32:5B
[8/24/2021, 1:38:13 PM] Registering platform 'homebridge-nest-cam.Nest-cam'

### Steps to reproduce

config:

        {
            "refreshToken": "1//06tXxxxxx",
            "googleAuth": {
                "issueToken": "https://accounts.google.com/o/oauth2/iframerpc?action=issueToken&response_type=token%20id_token&login_hint=xxxxx",
                "cookies": "__Secure-3PAPISID=xxxxx"
            },
            "options": {
                "ffmpegCodec": "libx264",
                "streamQuality": 1,
                "alertCheckRate": 10,
                "alertCooldownRate": 180,
                "importantOnly": true,
                "motionDetection": true,
                "streamingSwitch": true,
                "chimeSwitch": true,
                "announcementsSwitch": true,
                "doorbellAlerts": true,
                "doorbellSwitch": true,
                "audioSwitch": true,
                "fieldTest": true
            },
            "platform": "Nest-cam",
            "_bridge": {
                "username": "0E:A6:45:AC:32:5B",
                "port": 40202
            }
        },

### Device Type

Raspberry Pi

### iOS Version

IOS14

### Camera Types

Wired Nest Doorbell

### Bug Persistence

Consistently

### Last Working Version

_No response_