Dragino parser

src/udi/handlers/ttn/models/draginoLdds75/draginoLdds75.go

@@ -0,0 +1,61 @@
+package draginoLdds75
+
+import (
+  "fmt"
+  "strings"
+  "strconv"
+  "encoding/json"
+  "udi/database"
+)
+
+/*
+    "decoded_payload": {
+      "Bat": 3.299,
+      "Distance": "352 mm",
+      "Interrupt_flag": 0,
+      "Sensor_flag": 1,
+      "TempC_DS18B20": "0.00"
+    },
+*/
+type message struct {
+  Bat float32 `json:"Bat"`
+  Distance string `json:"Distance"`
+  Interrupt_flag int `json:"Interrupt_flag"`
+  Sensor_flag int `json:"Sensor_flag"`
+  TempC_DS18B20 string `json:"TempC_DS18B20"`
+}
+
+func Parse(fPort int, decodedPayload []byte, variables *map[string]database.VariableType) error {
+  if fPort != 2 {
+    return fmt.Errorf("Unexpected fPort %d", fPort)
+  }
+  var message message
+  err := json.Unmarshal(decodedPayload, &message)
+  if err != nil {
+    return fmt.Errorf("Unable to parse payload, fPort %d, error %s", fPort, err)
+  }
+  distanceParts := strings.Split(message.Distance, " ")
+  if len(distanceParts) != 2 && distanceParts[1] != "mm" {
+    return fmt.Errorf("Invalid format for distance value: %s", message.Distance)
+  }
+  distance, err2 := strconv.Atoi(distanceParts[0])
+  if err2 != nil {
+    return fmt.Errorf("Distance value is no number: %s -> %s", message.Distance, err2)
+  }
+  (*variables)["Battery"] = database.VariableType {
+    Label: "Battery",
+    Variable: "Voltage",
+    Unit: "V",
+    Value: message.Bat,
+  }
+  (*variables)["Distance"] = database.VariableType {
+    Label: "Distance",
+    Variable: "Level",
+    Unit: "mm",
+    Value: distance,
+  }
+  return nil
+}
+
+
+