iotedgedev monitor hangs with no telemetry output

- iotedgedev Version: 2.2.0
- Python Version: 3.6.0
- Pip Version: 20.2.4
- Development machine OS Version: Windows 10
- IoT Edge device OS Version: Ubuntu 18.04
- azure-cli version: 2.18.0

Steps to Reproduce:

1. Run iotedgedev in pypi form from virtual environment
```
mkdir temp
cd temp
/Scripts/activate
pip install iotedgedev
iotedgedev init
# follow iothub setup script
```
2. Build, deploy and monitor
```
iotedgedev build
iotedgedev deploy
iotedgedev start
iotedgedev monitor
```

Output from `iotedgedev monitor` hangs with the following output:
```
================================
======== MONITOR EVENTS ========
================================

It may take 1-2 minutes before you start to see messages below.

Starting event monitor, filtering on device: iotedgedev-edgedevice, use ctrl-c to stop...
```

Think this may be an az cli issue as `az cli iot hub event-monitor` also does not produce output.