Network Device Discovery/Connection Issue

I have a private class C network which is 10.221.99.0 and I'm having a device discovery issue when trying to transfer videos between my iPhone 4S (running iOS 5.1.1) and my iPad 3 (also running 5.1.1) using your Photo Transfer app that I just purchased. My iPhone has a static address of 10.221.99.8 and my iPad has a static address of 10.221.99.9. In addition, I have a Dell PC on the network which also has a static address of 10.221.99.3. My issue is:

1. When going into Receive mode on my iPad, the iPad does not discover any devices on my LAN;

2. When going into Receive mode on my iPhone, it will discover my iPad as well as my Dell laptop but if I choose the iPad and then choose "Get Videos", it will time out with the message "We couldn't contact the device selected".

3. If I manually enter the correct IP/port on either my iPhone or my iPad, it will then properly connect and transfer the videos (i.e. in either direction).

I love your app -- but want to figure out the network discovery issue/bug so that I don't have to manually enter the IP address each time I use it. Note that I am a computer developer myself and set up my own network and there is nothing preventing discovery or communication between the devices on my private LAN.