Vines and Climbers: Need some help ID'g this vine from Gma's farm, 1 by Kizmo

Kizmo wrote:
Hello everyone! I need some help on this vine. It originally came from my Gma's farm in IN over 40 yrs ago, then as we moved, the seed pods came with us. Mom gave me a handful last year and I planted them here in OH. A couple months later, and they're doing beautifully. However, I don't know what to tell neighbors of what it actually is, other than "Grandma's Vine"... LOL
It grows quickly, the older stems are sort of woody, has lovely purple sweet-pea type blooms and the seed pods resemble purple lima bean pods. The seed itself is pea-sized, dark purple/brown with a hard shell. I knicked the small white spot on the side of the seed, soaked them in water for a few days and planted. Didn't take long for them to pop up. Mom says whereever the seed pod lands outside, will probably produce the following year.

Any ideas on what this is? Thanks much for any help!