You might do some Google-based research too.
Try searching for things like "turnkey hotspot" and look for package vendors. Then follow up by looking at their customer (sales) stuff, browse support options, read through documentation downloads, etc. Do some more searches on product names and models to locate 3rd-party talk about their stuff, etc.
Chase down the suppliers of their hardware and software (where this can be determined) for more details.
Going through a number of such vendors' sites thoroughly might give you an overview and help you determine what technical background you'll want to accumulate. Then you can dig into that deeper if it seems appropriate.
The market might be getting saturated at the "OEM" level. There might be room though in sales and support roles, and who knows? Maybe there's a vending machine outfit or telecom provider looking for a guy to help them break into the local market.