User's Guide

compatibility with existing OVMS v2 cellphone apps and servers, OVMS v3 includes full support
for the OVMS v2 protocol.
OVMS Server v3
The OVMS Server v3 protocol is MQTT. This is an industry standard protocol, and means an
OVMS v3 module can communicate with any standard MQTT server. While this is the future of
OVMS, support for this is experimental at the moment and production users should use OVMS
Server v2 protocol.
Upgrading from OVMS v1/v2
The antenna and vehicle connectors for OVMS v3 are the same as for OVMS v2, and existing
cables/antennas can generally be re-used for OVMS v3. Note, however, that the frequency
ranges supported by individual 3G networks may be different than 2G, so may benefit from an
antenna specifically designed for the 3G frequency ranges used.
OVMS v3 User Guide Page 11 / 86