dwCANInterpreter_geti32 takes an int32_t as the value parameter but it never returns negative values! Any negative values on the CAN bus are returned as 0. Is this a bug?
It seems dwCANInterpreter_getf32|64 is the only way to pull a signed integer using the CAN Interpreter (using some conversion).
Ideally, we want getu32, geti16, geti8, getbool, supported to make the CAN interpreter more useful.