6lowpan only addresses running IPv6 over 802.15.4 PHYs. It defines how to compress IPv6 headers to fit into 802.15.4 MTUs. CHoIP will define application-layer

6lowpan only addresses running IPv6 over 802.15.4 PHYs. It defines how to compress IPv6 headers to fit into 802.15.4 MTUs. CHoIP will define application-layer messaging that runs over IP, regardless of PHY. So, you can run CHoIP over 6lowpan (this is essentially what CHoIP on Thread would be).