How to get upstream ip address from a WASM filter

[NomadXD]

I am trying to get the upstream host ip address from a WASM filter using getValue() method. I tried ,

std::string remote_ip;
auto buffer = getValue({"upstream", "address"}, &remote_ip);
LOG_INFO("remote_ip >>>>>>>>>>>>>>>"+remote_ip);

but it's not working. It returns env.proxy_get_property return: 1 which I assume should be 0 if everything's correct. I had a look at this method https://github.com/envoyproxy/envoy/blob/c93d486c2d303dbf2cc9f88717de0bfd66e1afdb/source/extensions/common/wasm/context.cc#L490 from envoy source code and they have implemented it. Anything wrong with the way i'm using it ?