Does laird Connectivity support Nordic Enhanced Shock Burst (ESB)?

Yes, but software support should be sought direct from the Nordic Devzone as from Lairds point of view we provide only the hardware not the protocol.

Enhanced Shockburst (ESB) is a proprietary simple packet protocol for use in the Nordic modules. It is simple and easy to use and can give very low latency applications compared to BLE.

However, there is no encryption employed in ESB and ESB operates on a single frequency channel so there is no frequency immunity. You can implement your own encryption in upper layers though.

Also see Gazell (GZLL), which is another proprietary protocol from Nordic that builds on ESB.