Seeing this post resurface, let me interject with a related piece of news. BrandMeister's initial main server project, the 2001 plan, disconnected from other internet connections and fully migrated to the Hamnet network (which uses the IP address range 44.0.0.0/8), citing the fact that the Hamnet network already had a significant number of users and radio access points in Europe. In some ways, the vision of the Hamnet network replacing traditional amateur radio's AX.25 network in Europe has been realized.
BG5BQB However, it's not always about experimentation; most DMR users don't come to it specifically for that purpose.
Ignoring voice communication (since bandwidth is not as good as P25 and YSF), because DMR uses the IP protocol, it would actually be easier to get started with than other modes if you delve a bit deeper (there are plenty of IPv4-related tools). However, there has been no commercial push, and manufacturers have not made specific modifications for amateur use. As a result, DMR currently only has a limited APRS version for amateur use, and this is not implemented on the device side. Even if you want to delve deeper, there are no common handheld radios that can directly expose the DMR internal IP network to users.
Of course, SDR can do it. However, DMR's use of time slots makes it impossible to directly filter out the cheap, un-timestamped SDR development boards (specifically mentioning a large company starting with "A").
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