[BUG]
**Describe the bug**
¨Homebridge is sometime slow to respond, I got this error in the logs : 

[6/17/2021, 9:18:11 AM] [homebridge-harmony] This plugin slows down Homebridge. The read handler for the characteristic 'On' was slow to respond! See https://git.io/JtMGR for more info.
[6/17/2021, 9:18:17 AM] [homebridge-harmony] This plugin slows down Homebridge. The read handler for the characteristic 'On' didn't respond at all!. Please check that you properly call the callback! See https://git.io/JtMGR for more info.

**To Reproduce**
None

**Expected behavior**
My devices become not responsive during a time

**Screenshots**
If applicable, add screenshots to help explain your problem.

**IOS (please complete the following information):**
- Version 14.6
- Device: iPhone 12 Pro Max

**Logs**
[6/17/2021, 9:18:11 AM] [homebridge-harmony] This plugin slows down Homebridge. The read handler for the characteristic 'On' was slow to respond! See https://git.io/JtMGR for more info.
[6/17/2021, 9:18:17 AM] [homebridge-harmony] This plugin slows down Homebridge. The read handler for the characteristic 'On' didn't respond at all!. Please check that you properly call the callback! See https://git.io/JtMGR for more info.

**Config**
"name": "Galaxy - Harmony",
            "hubIP": "192.168.1.249",
            "hubName": "Galaxy - Harmony",
            "mainActivity": "Apple TV",
            "DELAY_BEFORE_RETRY_AFTER_NETWORK_LOSS": 60000,
            "HUB_CONNECT_TIMEOUT": 10000,
            "HUB_SEND_TIMEOUT": 30000,
            "showTurnOffActivity": "true",
            "linkVolumeControlToTV": true,
            "platform": "HarmonyHubWebSocket"

**Additional context**
Synology Docker DSM7
Node JS : 14.17.1
Nmp : 6.14.13

Thanks for the help 
