symbol "+": ERE53+//=. I am getting an error: "{"code":3, "message":"proto: (line 1:43): invalid value for bytes type: \"ERE53+//=\"", "details":[]} "

Hello, I am using an api http request to send a command to a base64 device that contains the + symbol: ERE53+//=. I am getting an error: "{"code":3, "message":"proto: (line 1:43): invalid value for bytes type: "ERE53+//="", "details":[]} "