Be aware that simply broadcasting a UDP packet containing the Wake-On-LAN signature will probably only have an effect if the device you are waking up is connected via Ethernet.

So for example, by connecting a PS3 via ethernet to an access point. The Pronto can transmit the UDP packet via WiFi to the access point, which will propagate it via Ethernet to the PS3.

If the PS3 is only attached via WiFi to the rest of the network, probably WMM needs to be used, which cannot be done directly from ProntoScript (you'd need to trigger some other device to send out the wake signal via WMM).