Your best bet is DASH7.
It's pretty unknown even among nerds, but if you want a solid industrial stack, DASH7 it is. In case you haven't heard of DASH7 before, it's the official IoT standard of all NATO member countries and the Department of Defense:
DASH7 has been mandated by the U.S. Department of Defense (DoD) and NATO alliance.
The beauty of DASH7 is that it specifies all layers of the OSI model, which is really a relief in the current chaos surrounding IoT protocols. There's no fuss about whether some layer stitches well with the protocol you've chosen for the layer below, etc. It is also not in the heavily populated 2.4 GHz ISM band, but can work on 433 MHz, for example.
And since it is backed by such powerful organizations, you can expect it to be here for a long time. Furthermore, the stack is derived from ISO/IEC 18000-7 (hence the name "DASH7") and the full specification is free for download.
DASH7 was, by the way, used in the Gulf War for logistics. There are some development boards available and it is also targeted towards Texas Instrument's MSP430.