We are doing a project where we are going to use a Raspberry Pi as an Internet of Things, sensor network gateway. So, we've concluded that the Raspberry Pi must have a CoAP client application installed in order to be able to make request to sensor nodes. We have only read about people using the Pi as a CoAP server before, and wonder what the best way is to install a CoAP client on the Pi instead.
Is it easier to install Contiki on the Pi and a CoAP client after that? There seems to be many CoAP implementations for Contiki, not many for Raspbian.
Or is there a CoAP client application that is possible to run on Raspberry Pi (we have not found one)?