json node:

always convert to JavaScript object
===================================
Function node of flow:

input = msg.payload
var Hum_SHT = input.object.Hum_SHT
var TempF_SHT= input.object.TempF_SHT
msg = {payload:{"Hum_SHT":Hum_SHT, "TempF_SHT":TempF_SHT}};
return msg;

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emoncms node:

server		emonpi
node		lht52
data type	valid JSON object
name 		lht52