In the document "SoftDevice Specification v2.0", chapter "3.1 Profile and service support", it says it support "Environmental Sensing" profile.
But, in the nRF51 SDK, yet support ESS example.
When can I get ESS example?
The fact that the SoftDevice supports it does not mean that our SDK has an example for it. I have made an internal request and it will probably be supported in the future.