To get sensors value from the last message, use the command unit/calc_last_message:
svc=unit/calc_last_message¶ms={"unitId":<long>, "sensors":[<long>], "flags":<uint>}
| Name | Description | 
|---|---|
| unitId | unit ID | 
| sensors | array of sensors IDs (optional parameter, if not specified or empty - return values of all sensors) | 
| flags | flags (optional): if 1, then calculate sensor value by last valid param value | 
{ <text>:<double|text>, /* sensor ID: sensor value */ ... }