Lorawan uplink support and new lorawan 'basic-demo' example

examples/lora/lorawan/basic-demo/README.md

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+# Simple Lorawan example
+
+This demo code will connect Lorawan network and send sample uplink message
+
+You may change your Lorawan keys (AppEUI, DevEUI, AppKEY) in key-default.go
+
+
+```
+$ tinygo monitor
+Connected to /dev/ttyACM0. Press Ctrl-C to exit.
+Lorawan Simple Demo
+Start Lorawan Join sequence
+loraConnect: Connected !
+```
+
+# Building
+
+## Simulator
+
+```
+tinygo flash -target pico ./examples/lora/lorawan/basic-demo
+```
+
+## PyBadge with LoRa Featherwing 
+
+```
+tinygo flash -target pybadge -tags featherwing ./examples/lora/lorawan/basic-demo
+```
+
+## LoRa-E5 
+
+```
+tinygo flash -target lorae5 ./examples/lora/lorawan/basic-demo
+```
+

examples/lora/lorawan/basic-demo/keys-default.go

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+//go:build !customkeys
+
+package main
+
+// These are sample keys, so the example builds
+// Either change here, or create a new go file and use customkeys build tag
+func setLorawanKeys() {
+	otaa.SetAppEUI([]uint8{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00})
+	otaa.SetDevEUI([]uint8{0xB3, 0xD5, 0x41, 0x00, 0x0A, 0xF1, 0xA4, 0x45})
+	otaa.SetAppKey([]uint8{0x12, 0x22, 0xA3, 0xFF, 0x0C, 0x7B, 0x76, 0x7B, 0x8F, 0xD3, 0x12, 0x4F, 0xCE, 0x7A, 0x32, 0x16})
+}

examples/lora/lorawan/basic-demo/main.go

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+// Simple code for connecting to Lorawan network and uploading sample payload
+package main
+
+import (
+	"errors"
+	"strconv"
+	"time"
+
+	"tinygo.org/x/drivers/examples/lora/lorawan/common"
+	"tinygo.org/x/drivers/lora"
+	"tinygo.org/x/drivers/lora/lorawan"
+)
+
+const (
+	LORAWAN_JOIN_TIMEOUT_SEC    = 180
+	LORAWAN_RECONNECT_DELAY_SEC = 15
+	LORAWAN_UPLINK_DELAY_SEC    = 60
+)
+
+var (
+	radio   lora.Radio
+	session *lorawan.Session
+	otaa    *lorawan.Otaa
+)
+
+func loraConnect() error {
+	start := time.Now()
+	var err error
+	for time.Since(start) < LORAWAN_JOIN_TIMEOUT_SEC*time.Second {
+		println("Trying to join network")
+		err = lorawan.Join(otaa, session)
+		if err == nil {
+			println("Connected to network !")
+			return nil
+		}
+		println("Join error:", err, "retrying in", LORAWAN_RECONNECT_DELAY_SEC, "sec")
+		time.Sleep(time.Second * LORAWAN_RECONNECT_DELAY_SEC)
+	}
+
+	err = errors.New("Unable to join Lorawan network")
+	println(err.Error())
+	return err
+}
+
+func failMessage(err error) {
+	println("FATAL:", err)
+	for {
+	}
+}
+
+func main() {
+	println("*** Lorawan basic join and uplink demo ***")
+
+	// Board specific Lorawan initialization
+	var err error
+	radio, err = common.SetupLora()
+	if err != nil {
+		failMessage(err)
+	}
+
+	// Required for LoraWan operations
+	session = &lorawan.Session{}
+	otaa = &lorawan.Otaa{}
+
+	// Initial Lora modulation configuration
+	loraConf := lora.Config{
+		Freq:           868100000,
+		Bw:             lora.Bandwidth_125_0,
+		Sf:             lora.SpreadingFactor9,
+		Cr:             lora.CodingRate4_7,
+		HeaderType:     lora.HeaderExplicit,
+		Preamble:       12,
+		Ldr:            lora.LowDataRateOptimizeOff,
+		Iq:             lora.IQStandard,
+		Crc:            lora.CRCOn,
+		SyncWord:       lora.SyncPublic,
+		LoraTxPowerDBm: 20,
+	}
+	radio.LoraConfig(loraConf)
+
+	// Connect the lorawan with the Lora Radio device.
+	lorawan.UseRadio(radio)
+
+	// Configure AppEUI, DevEUI, APPKey
+	setLorawanKeys()
+
+	// Try to connect Lorawan network
+	if err := loraConnect(); err != nil {
+		failMessage(err)
+	}
+
+	// Try to periodicaly send an uplink sample message
+	upCount := 1
+	for {
+		payload := "Hello TinyGo #" + strconv.Itoa(upCount)
+
+		if err := lorawan.SendUplink([]byte(payload), session); err != nil {
+			println("Uplink error:", err)
+		} else {
+			println("Uplink success, msg=", payload)
+		}
+
+		println("Sleeping for", LORAWAN_UPLINK_DELAY_SEC, "sec")
+		time.Sleep(time.Second * LORAWAN_UPLINK_DELAY_SEC)
+		upCount++
+	}
+}