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Add optional Base64 decoding support to ChangePayload API #42

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Add optional Base64 decoding support to ChangePayload API #42

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c61b8f8
feat: update ChangePayload to allow base64 payload
picope Nov 20, 2025
0e0b1c8
Merge pull request #1 from picope/feat/change-payload-base64
picope Nov 20, 2025
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32 changes: 26 additions & 6 deletions simulator/api.go
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@ package simulator

import (
"encoding/hex"
"encoding/base64"
"errors"
"fmt"
"github.com/arslab/lwnsimulator/shared"
Expand Down Expand Up @@ -352,15 +353,34 @@ func (s *Simulator) ChangePayload(pl socket.NewPayload) (string, bool) {
MType = lorawan.ConfirmedDataUp
}

Payload := &lorawan.DataPayload{
Bytes: []byte(pl.Payload),
}
// -------------------------------
// NEW: decode payload if IsBase64
// -------------------------------
var payloadBytes []byte
var err error

if pl.IsBase64 {
payloadBytes, err = base64.StdEncoding.DecodeString(pl.Payload)
if err != nil {
s.Console.PrintSocket(socket.EventResponseCommand,
"Invalid Base64 payload: "+err.Error())
return devEUIstring, false
}
} else {
// original behavior: raw bytes from string
payloadBytes = []byte(pl.Payload)
}

Payload := &lorawan.DataPayload{
Bytes: payloadBytes,
}

s.Devices[pl.Id].ChangePayload(MType, Payload)
s.Devices[pl.Id].ChangePayload(MType, Payload)

s.Console.PrintSocket(socket.EventResponseCommand, s.Devices[pl.Id].Info.Name+": Payload changed")
s.Console.PrintSocket(socket.EventResponseCommand,
s.Devices[pl.Id].Info.Name+": Payload changed")

return devEUIstring, true
return devEUIstring, true
}

func (s *Simulator) SendUplink(pl socket.NewPayload) {
Expand Down
7 changes: 4 additions & 3 deletions socket/models.go
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Original file line number Diff line number Diff line change
Expand Up @@ -20,9 +20,10 @@ type NewStatusDev struct {

// NewPayload represents a structure for handling payload changes with ID, message type, and payload data.
type NewPayload struct {
Id int `json:"id"` // Id is the unique identifier of the payload.
MType string `json:"mtype"` // MType is the message type.
Payload string `json:"payload"` // Payload is the actual payload data.
Id int `json:"id"` // Id is the unique identifier of the payload.
MType string `json:"mtype"` // MType is the message type.
Payload string `json:"payload"` // Payload is the actual payload data.
IsBase64 bool `json:"isbase64"` // If True, payload is decoded as base64.
}

// NewLocation represents the geographical location of a device.
Expand Down