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downlink.go
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downlink.go
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// Copyright © 2017 The Things Network
// Use of this source code is governed by the MIT license that can be found in the LICENSE file.
package cmd
import (
"encoding/json"
"strings"
"github.com/TheThingsNetwork/api"
"github.com/TheThingsNetwork/ttn/core/types"
"github.com/TheThingsNetwork/ttn/ttnctl/util"
"github.com/spf13/cobra"
)
var downlinkCmd = &cobra.Command{
Use: "downlink [DevID] [Payload]",
Short: "Send a downlink message to a device",
Long: `ttnctl downlink can be used to send a downlink message to a device.`,
Example: `$ ttnctl downlink test aabc
INFO Connecting to MQTT...
INFO Connected to MQTT
INFO Enqueued downlink AppID=test DevID=test
$ ttnctl downlink test --json '{"led":"on"}'
INFO Connecting to MQTT...
INFO Connected to MQTT
INFO Enqueued downlink AppID=test DevID=test
`,
Run: func(cmd *cobra.Command, args []string) {
assertArgsLength(cmd, args, 2, 2)
appID := util.GetAppID(ctx)
ctx = ctx.WithField("AppID", appID)
devID := strings.ToLower(args[0])
if err := api.NotEmptyAndValidID(devID, "Device ID"); err != nil {
ctx.Fatal(err.Error())
}
ctx = ctx.WithField("DevID", devID)
jsonflag, err := cmd.Flags().GetBool("json")
if err != nil {
ctx.WithError(err).Fatal("Failed to read json flag")
}
fPort, err := cmd.Flags().GetInt("fport")
if err != nil {
ctx.WithError(err).Fatal("Failed to read fport flag")
}
confirmed, err := cmd.Flags().GetBool("confirmed")
if err != nil {
ctx.WithError(err).Fatal("Failed to read confirmed flag")
}
accessKey, err := cmd.Flags().GetString("access-key")
if err != nil {
ctx.WithError(err).Fatal("Failed to read access-key flag")
}
client := util.GetMQTT(ctx, accessKey)
defer client.Disconnect()
message := types.DownlinkMessage{
AppID: appID,
DevID: devID,
FPort: uint8(fPort),
Confirmed: confirmed,
}
if args[1] == "" {
ctx.Info("Invalid command")
cmd.UsageFunc()(cmd)
return
}
if jsonflag {
// Valid payload provided + json flag
_, err := types.ParseHEX(args[1], len(args[1])/2)
if err == nil {
ctx.WithError(err).Fatal("You are providing a valid HEX payload while sending payload in JSON.")
}
err = json.Unmarshal([]byte(args[1]), &message.PayloadFields)
if err != nil {
ctx.WithError(err).Fatal("Invalid json string")
return
}
} else { // Payload provided
payload, err := types.ParseHEX(args[1], len(args[1])/2)
if err != nil {
ctx.WithError(err).Fatal("Invalid Payload")
}
message.PayloadRaw = payload
}
token := client.PublishDownlink(message)
token.Wait()
if token.Error() != nil {
ctx.WithError(token.Error()).Fatal("Could not enqueue downlink")
}
ctx.Info("Enqueued downlink")
},
}
func init() {
RootCmd.AddCommand(downlinkCmd)
downlinkCmd.Flags().Int("fport", 1, "FPort for downlink")
downlinkCmd.Flags().Bool("confirmed", false, "Confirmed downlink")
downlinkCmd.Flags().Bool("json", false, "Provide the payload as JSON")
downlinkCmd.Flags().String("access-key", "", "The access key to use")
}