Cadwallader returned to the club in January 2015 after a previous spell with the Robins.
He turned out as a professional at Shrewsbury Town, before spells with Druids, Aberystwyth and Airbus.
After coming back from injury mid way through last season, Cadwallader struggled to get back in the side.
In the summer he retired from the game and was installed as first team coach in the Robins back room team.
Signed on for the first team squad when called upon.