calibrate and appkey commands

.gitignore

@@ -1 +1,3 @@
 mini-beieli-provision-cubecell
+appkey
+calibrate

appkey.go

@@ -0,0 +1,62 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+func getAppKey(deveui string) string {
+	if len(deveui) == 16 {
+		appkey := fmt.Sprintf("%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c",
+			deveui[10],
+			deveui[3],
+			deveui[4],
+			deveui[7],
+			deveui[15],
+			deveui[9],
+			deveui[11],
+			deveui[2],
+			deveui[0],
+			deveui[8],
+			deveui[1],
+			deveui[6],
+			deveui[5],
+			deveui[12],
+			deveui[14],
+			deveui[13],
+			deveui[3],
+			deveui[6],
+			deveui[12],
+			deveui[7],
+			deveui[15],
+			deveui[1],
+			deveui[9],
+			deveui[11],
+			deveui[2],
+			deveui[10],
+			deveui[0],
+			deveui[8],
+			deveui[5],
+			deveui[14],
+			deveui[4],
+			deveui[13])
+
+		return appkey
+
+	} else {
+		fmt.Printf("devEui has wrong length: %s\n", deveui)
+		return ""
+	}
+}
+
+func main() {
+	if len(os.Args) != 2 {
+		fmt.Println("usage: " + filepath.Base(os.Args[0]) + " <DevEui>")
+		os.Exit(1)
+	}
+
+	devEui := os.Args[1]
+	appKey := getAppKey(devEui)
+	fmt.Printf("%s\n", appKey)
+}

calibrate.go

@@ -0,0 +1,149 @@
+package main
+
+import (
+	"bufio"
+	"encoding/json"
+	"fmt"
+	"github.com/tarm/serial"
+	"log"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"time"
+)
+
+type SensorData struct {
+	WeightARaw string `json:"weight_a_raw"`
+	WeightBRaw string `json:"weight_b_raw"`
+}
+
+// returns last line of output
+func sendCommand(p *serial.Port, command string) string {
+	fmt.Printf("%s\n", command)
+	var last_line string = ""
+	p.Flush()
+	_, err := p.Write([]byte(command))
+	if err != nil {
+		log.Fatal(err)
+	}
+	buf := make([]byte, 1024)
+
+	time.Sleep(500 * time.Millisecond)
+
+	n, _ := p.Read(buf)
+	if n > 0 {
+		last_line_arr := strings.Split(string(buf[:n]), "\n")
+		//fmt.Printf("AAA: %+q\n", last_line_arr)
+		last_line = last_line_arr[len(last_line_arr)-2]
+
+		fmt.Print(string(buf[:n]))
+	}
+	return last_line
+}
+
+// returns output
+func sendCommandJSON(p *serial.Port, command string) string {
+	fmt.Printf("%s\n", command)
+	var res string = ""
+	p.Flush()
+	_, err := p.Write([]byte(command))
+	if err != nil {
+		log.Fatal(err)
+	}
+	buf := make([]byte, 1024)
+
+	time.Sleep(3000 * time.Millisecond)
+
+	n, _ := p.Read(buf)
+	if n > 0 {
+		res = string(buf[:n-1])
+	}
+	return res
+}
+
+func getDevEui(p *serial.Port) string {
+	var reply = sendCommand(p, "AT+ChipID=?")
+	//fmt.Printf("XXX%sYYY\n",reply)
+	if len(reply) >= 20 {
+		return "0000" + reply[8:20]
+	} else {
+		return ""
+	}
+}
+
+func ReadSensorData(p *serial.Port) SensorData {
+	var reply = sendCommandJSON(p, "AT+READ_SENSORS=?")
+	fmt.Printf("XXX%sYYY\n", reply)
+
+	var data SensorData
+	json.Unmarshal([]byte(reply), &data)
+	//fmt.Printf("%v \n", data)
+
+	//fmt.Printf("weight_a_raw: %s\n", data.WeightARaw)
+	//fmt.Printf("weight_b_raw: %s\n", data.WeightBRaw)
+
+	return data
+}
+
+func readSerial(p *serial.Port) {
+	p.Flush()
+	buf := make([]byte, 32)
+
+	time.Sleep(200 * time.Millisecond)
+	n, _ := p.Read(buf)
+	for n > 0 {
+		// ignoring error as EOF raises error on Linux
+		reply := string(buf[:n])
+		fmt.Print(reply)
+		n, _ = p.Read(buf)
+	}
+}
+
+func main() {
+	if len(os.Args) != 3 {
+		fmt.Println("usage: " + filepath.Base(os.Args[0]) + " <SerialDevice> <calibration_weight_in_gram>")
+		os.Exit(1)
+	}
+
+	serialdev := os.Args[1]
+	calWeightS := os.Args[2]
+	calWeight, _ := strconv.Atoi(calWeightS)
+
+	c := &serial.Config{Name: serialdev, Baud: 115200, ReadTimeout: time.Second * 1}
+	s, err := serial.OpenPort(c)
+	if err != nil {
+		log.Fatal("Problem mit Serial Interface")
+	}
+
+	sendCommand(s, "AT+XXX")
+	devEui := getDevEui(s)
+	reader := bufio.NewReader(os.Stdin)
+	if devEui != "" {
+		fmt.Println("Hit Return when no weight is on scale (neither on A not on B)")
+		reader.ReadString('\n')
+		sensorData := ReadSensorData(s)
+		fmt.Printf("%v\n", sensorData)
+		a0, _ := strconv.Atoi(sensorData.WeightARaw)
+		b0, _ := strconv.Atoi(sensorData.WeightBRaw)
+		sendCommand(s, "AT+CAL_A_0="+sensorData.WeightARaw)
+		sendCommand(s, "AT+CAL_B_0="+sensorData.WeightBRaw)
+		fmt.Println("Put Weight on Scale A, then hit Return")
+		reader.ReadString('\n')
+		sensorData = ReadSensorData(s)
+		aW, _ := strconv.Atoi(sensorData.WeightARaw)
+		fmt.Println("Put Weight on Scale B, then hit Return")
+		reader.ReadString('\n')
+		sensorData = ReadSensorData(s)
+		bW, _ := strconv.Atoi(sensorData.WeightBRaw)
+		calA := float64(aW-a0) / float64(calWeight)
+		calB := float64(bW-b0) / float64(calWeight)
+		sendCommand(s, "AT+CAL_A_FACTOR="+fmt.Sprintf("%f", calA))
+		sendCommand(s, "AT+CAL_B_FACTOR="+fmt.Sprintf("%f", calB))
+		sendCommand(s, "AT+READ_CONFIG=?")
+		sendCommand(s, "AT+RESET=1")
+		readSerial(s)
+	} else {
+		log.Fatal("Could not get devEui (that is: ChipID)")
+	}
+}