Passing on entity value to VERA using HTTP

Configuration
1

There is a need to pass on certain entity values to VERA for which I made an attempt as follows:

- platform: rest
  resource: http://xxx.xxx.xxx.xxx:3480/data_request?id=variableset&DeviceNum=190&serviceId=urn:micasaverde-com:serviceId:HumiditySensor1&Variable=CurrentLevel&Value={{entity_id:sensor.br_humidity}}
  method: GET

Al I get into VERA’s variable value is the text: {{entity_id:sensor.br_humidity}}. Is this just a syntex error or is the variable definition wrong.
Any advice would be appreciated.
Any help how to get the