Interested to know which wifi devices are around? Use a Raspberry Pi to detect devices even if these are not connected to any wifi access point……
RaspberryPi
Getting to know the DHCP IP address of your RaspberryPi without a display (by sending you a mail)
How so solve the well known chicken and the egg problem with a Raspberry Pi: you boot the device on a new network, you want to ssh to it, but you don’t know the IP address.