groundlevel stuff

src/udi/handlers/ttn/models/draginoLmds200/draginoLmds200.go

@@ -2,6 +2,7 @@ package draginoLmds200
 
 import (
   "fmt"
+  "strconv"
   "encoding/json"
   "udi/database"
 )
@@ -25,7 +26,7 @@ type message struct {
   Dis2 int `json:"dis2"`
 }
 
-func Parse(fPort int, decodedPayload []byte, variables *map[string]database.VariableType) error {
+func Parse(fPort int, decodedPayload []byte, variables *map[string]database.VariableType, device *database.Device) error {
   if fPort != 2 {
     return fmt.Errorf("Unexpected fPort %d", fPort)
   }
@@ -40,17 +41,38 @@ func Parse(fPort int, decodedPayload []byte, variables *map[string]database.Vari
     Unit: "V",
     Value: message.Bat,
   }
+  distance1 := message.Dis1 * 10
   (*variables)["Distance1"] = database.VariableType {
     Label: "Distance1",
     Variable: "Level",
     Unit: "mm",
-    Value: (message.Dis1 * 10),
+    Value: distance1,
   }
+  distance2 := message.Dis2 * 10
   (*variables)["Distance2"] = database.VariableType {
     Label: "Distance2",
     Variable: "Level",
     Unit: "mm",
-    Value: (message.Dis2 * 10),
+    Value: distance2,
+  }
+  groundLevelI, exists := device.Attributes["GroundLevel"]
+  groundLevelS, ok := groundLevelI.(string)
+  groundLevel, err3 := strconv.Atoi(groundLevelS)
+  if exists && err3 == nil && ok {
+    correctedDistance1 := groundLevel - distance1
+    (*variables)["CorrectedDistance1"] = database.VariableType {
+      Label: "CorrectedDistance1",
+      Variable: "Level",
+      Unit: "mm",
+      Value: correctedDistance1,
+    }
+    correctedDistance2 := groundLevel - distance2
+    (*variables)["CorrectedDistance2"] = database.VariableType {
+      Label: "CorrectedDistance2",
+      Variable: "Level",
+      Unit: "mm",
+      Value: correctedDistance2,
+    }
   }
   return nil
 }