Hi Friend,
You can bring up a mesh link with IAP with the following method,
1. Create cluster with IAP-225 and IAP-205 and let them sync with image and configuration
2. Disable the extended SSID ( in the latest version 4.x, it is enabled)
3. you will find both the IAPs as mesh portals.
4. Remove the IAP from the Switch which you want to make mesh point and provide external power.
5. After booting, there will be a mesh link between two IAPs.
Hope I answered your query.
Please feel free for any further help on this.