Is an ADS-B or Flarm hardware required to show traffic?

Yes, with a "Flarm" or "iLevil2" device connected, you can enable the traffic awareness feature and broadcast your position via the Air Navigation Pro traffic server.

With this feature, Air Navigation Pro will show traffic information on your Moving Map and alert you in case of a collision risk.

Tablet: Map > Traffic > Simple traffic mode on or off. 

When it is on the symbol is a simple arrow shape.
When it is off, the TCAS is working to predict conflicts and it's displayed with the standard TCAS symbols.

Phone: 3 Dots > Map > Traffic > Simple traffic mode on or off. 

When it is on the symbol is a simple arrow shape.
When it is off, the TCAS is working to predict conflicts and it's displayed with the standard TCAS symbols.