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downlink_frame.go
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/
downlink_frame.go
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package marshaler
import (
"encoding/json"
"github.com/brocaar/lorawan/band"
"github.com/brocaar/loraserver/api/common"
"github.com/brocaar/loraserver/api/gw"
"github.com/golang/protobuf/jsonpb"
"github.com/golang/protobuf/proto"
"github.com/golang/protobuf/ptypes"
"github.com/pkg/errors"
)
// MarshalDownlinkFrame marshals the given DownlinkFrame.
func MarshalDownlinkFrame(t Type, df gw.DownlinkFrame) ([]byte, error) {
var b []byte
var err error
switch t {
case Protobuf:
b, err = proto.Marshal(&df)
case JSON:
var str string
m := &jsonpb.Marshaler{
EmitDefaults: true,
}
str, err = m.MarshalToString(&df)
b = []byte(str)
case V2JSON:
txPacket := gw.TXPacketBytes{
Token: uint16(df.Token),
TXInfo: gw.TXInfo{
Immediately: df.TxInfo.Immediately,
Frequency: int(df.TxInfo.Frequency),
Power: int(df.TxInfo.Power),
Board: int(df.TxInfo.Board),
Antenna: int(df.TxInfo.Antenna),
},
PHYPayload: df.PhyPayload,
}
copy(txPacket.TXInfo.MAC[:], df.TxInfo.GatewayId)
if df.TxInfo.TimeSinceGpsEpoch != nil {
if dur, err := ptypes.Duration(df.TxInfo.TimeSinceGpsEpoch); err == nil {
gwDur := gw.Duration(dur)
txPacket.TXInfo.TimeSinceGPSEpoch = &gwDur
}
}
if df.TxInfo.TimeSinceGpsEpoch == nil && !df.TxInfo.Immediately {
txPacket.TXInfo.Timestamp = &df.TxInfo.Timestamp
}
switch df.TxInfo.Modulation {
case common.Modulation_LORA:
modInfo := df.TxInfo.GetLoraModulationInfo()
if modInfo == nil {
return nil, errors.Wrap(err, "lora_modulation_info must not be nil")
}
txPacket.TXInfo.DataRate = band.DataRate{
Modulation: band.LoRaModulation,
SpreadFactor: int(modInfo.SpreadingFactor),
Bandwidth: int(modInfo.Bandwidth),
}
txPacket.TXInfo.CodeRate = modInfo.CodeRate
txPacket.TXInfo.IPol = &modInfo.PolarizationInversion
case common.Modulation_FSK:
modInfo := df.TxInfo.GetFskModulationInfo()
if modInfo == nil {
return nil, errors.Wrap(err, "fsk_modulation_info must not be nil")
}
txPacket.TXInfo.DataRate = band.DataRate{
Modulation: band.FSKModulation,
BitRate: int(modInfo.Bitrate),
Bandwidth: int(modInfo.Bandwidth),
}
}
b, err = json.Marshal(txPacket)
}
return b, err
}