gRPC testing with a type ANY

I am trying to send data through gRPC and i cannot seem to get the “Any” type to work.

For example
{ “ordredTime” : “12/12/2012 12:12:12”
“coffee” : {
@type”: “coffee.maker.make”,
“strengthstrong text”: 3,
“blend”: “Blue mind”,
“origin”: “Columbian”,

This will not un pack on the other side. has anyone else got experience of handling they any type.

I have tried make a base64 of the “any” type and a bit array like it suggests but this does not work.

Any help would be gratefully received (excuse the pun).