// ConvertFieldsDown converts the fields into a payload
func (h *handler) ConvertFieldsDown(ctx log.Interface, appDown *types.DownlinkMessage, ttnDown *pb_broker.DownlinkMessage) error {
if appDown.PayloadFields == nil || len(appDown.PayloadFields) == 0 {
return nil
}
if appDown.PayloadRaw != nil {
return errors.NewErrInvalidArgument("Downlink", "Both Fields and Payload provided")
}
app, err := h.applications.Get(appDown.AppID)
if err != nil {
return nil
}
functions := &DownlinkFunctions{
Encoder: app.Encoder,
Logger: functions.Ignore,
}
message, _, err := functions.Process(appDown.PayloadFields, appDown.FPort)
if err != nil {
return err
}
appDown.PayloadRaw = message
return nil
}
// ConvertFieldsUp converts the payload to fields using payload functions
func (h *handler) ConvertFieldsUp(ctx log.Interface, ttnUp *pb_broker.DeduplicatedUplinkMessage, appUp *types.UplinkMessage) error {
// Find Application
app, err := h.applications.Get(ttnUp.AppId)
if err != nil {
return nil // Do not process if application not found
}
functions := &UplinkFunctions{
Decoder: app.Decoder,
Converter: app.Converter,
Validator: app.Validator,
Logger: functions.Ignore,
}
fields, valid, err := functions.Process(appUp.PayloadRaw, appUp.FPort)
if err != nil {
return nil // Do not set fields if processing failed
}
if !valid {
return errors.NewErrInvalidArgument("Payload", "payload validator function returned false")
}
appUp.PayloadFields = fields
return nil
}