Unable to share from iPhone to Room Kit Plus via lighting HDMI adapter

[lzhu]

We are getting a black screen on the Room Kit Plus display (Room Kit Plus codec connected to a third party TV) when sharing content from iPhone using a Lighting HDMI adapter (adapter model: Lightning Digital AV Adapter - Lightning to HDMI - Apple (CA)). 

Connection flow: IPHONE > Lightning HDMI adapter > HDMI cable > Cisco Room Kit Plus codec (HDMI cable is plugged into the input connector 2 on the codec) > external TV.  

Sharing from IPHONE to the TV directly is working when bypass the codec, which means the adapter is working. However we are seeing a black screen on the TV when the codec is in the middle. I suspect the codec somehow prevents content on iPhone from showing up. 

Please let me know if there is a solution for this. Thank you.

[natalie.bennett]

If you go into the codec's webgui, Settings > Statuses > Video > Output Connector xx > Supported Resolutions - it may be that the iPhone's screen shape Resolution by iOS device — iOS Ref isn't compatible with the output monitor.  Have seen this before.  Change the output resolution to see if one of them can display your content source.

[Wayne DeNardi]

If you are displaying this locally, it should work, but if you are trying to send the content in a call, then this is "normal" behaviour.  This is usually caused by the iPhone marking its content as HDCP, so the codec (correctly) does not transmit the content in a call.

Some ways of working around this are:
- Enable AirPlay on your Room Kit Plus (assuming you're running a recent software version)
- Insert an additional device between the AV Adaptor and the codec to remove the HDCP.