Great question - I have worked on several projects relating directly to what you are describing (based on my initial understanding) including providing software interfacing for mobile/PC/TV for large-scale hardware manufacturers as well as for mobile devices connecting to sensors and translating/reading data sent from equipment buried several feet under the ground to track eco changes for contractors. Assuming by device we are referencing mobile/smartphones (and possibly connectivity with hardware on two different platforms?), in which case I would imagine Bluetooth connectivity should be able to get the job done for you. There are really a lot of factors that could go into either how to utilize Bluetooth, or if an alternative path towards connectivity would be required (the device types you're connecting, their congruence/similarity, if there are prompts on the push/pull pinging, where the data from each activity is being housed once completed, geo-relevancy and latency requirements to name a few.) I'd be happy to set aside a few minutes to talk about the details of your project and provide any additional insight I can on how can you connect these devices and build out your system.