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proprietary.go
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/
proprietary.go
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package proprietary
import (
"context"
"encoding/binary"
"github.com/gofrs/uuid"
"github.com/pkg/errors"
"github.com/brocaar/chirpstack-api/go/v3/common"
"github.com/brocaar/chirpstack-api/go/v3/gw"
"github.com/brocaar/chirpstack-network-server/v3/internal/backend/gateway"
"github.com/brocaar/chirpstack-network-server/v3/internal/band"
"github.com/brocaar/chirpstack-network-server/v3/internal/config"
"github.com/brocaar/chirpstack-network-server/v3/internal/helpers"
"github.com/brocaar/chirpstack-network-server/v3/internal/storage"
"github.com/brocaar/lorawan"
)
const defaultCodeRate = "4/5"
var tasks = []func(*proprietaryContext) error{
saveDownlinkFrames,
sendProprietaryDown,
}
type proprietaryContext struct {
ctx context.Context
MACPayload []byte
MIC lorawan.MIC
GatewayMACs []lorawan.EUI64
IPol bool
Frequency uint32
DR int
DownlinkFrames []gw.DownlinkFrame
}
var (
downlinkTXPower int
)
// Setup configures the package.
func Setup(conf config.Config) error {
downlinkTXPower = conf.NetworkServer.NetworkSettings.DownlinkTXPower
return nil
}
// Handle handles a proprietary downlink.
func Handle(ctx context.Context, macPayload []byte, mic lorawan.MIC, gwMACs []lorawan.EUI64, iPol bool, frequency uint32, dr int) error {
pctx := proprietaryContext{
ctx: ctx,
MACPayload: macPayload,
MIC: mic,
GatewayMACs: gwMACs,
IPol: iPol,
Frequency: frequency,
DR: dr,
}
for _, t := range tasks {
if err := t(&pctx); err != nil {
return err
}
}
return nil
}
func sendProprietaryDown(ctx *proprietaryContext) error {
var txPower int
if downlinkTXPower != -1 {
txPower = downlinkTXPower
} else {
txPower = band.Band().GetDownlinkTXPower(ctx.Frequency)
}
phy := lorawan.PHYPayload{
MHDR: lorawan.MHDR{
Major: lorawan.LoRaWANR1,
MType: lorawan.Proprietary,
},
MACPayload: &lorawan.DataPayload{Bytes: ctx.MACPayload},
MIC: ctx.MIC,
}
phyB, err := phy.MarshalBinary()
if err != nil {
return errors.Wrap(err, "marshal phypayload error")
}
for _, mac := range ctx.GatewayMACs {
downID, err := uuid.NewV4()
if err != nil {
return errors.Wrap(err, "new uuid error")
}
token := binary.BigEndian.Uint16(downID[0:2])
txInfo := gw.DownlinkTXInfo{
Frequency: ctx.Frequency,
Power: int32(txPower),
Timing: gw.DownlinkTiming_IMMEDIATELY,
TimingInfo: &gw.DownlinkTXInfo_ImmediatelyTimingInfo{
ImmediatelyTimingInfo: &gw.ImmediatelyTimingInfo{},
},
}
err = helpers.SetDownlinkTXInfoDataRate(&txInfo, ctx.DR, band.Band())
if err != nil {
return errors.Wrap(err, "set downlink tx-info data-rate error")
}
// for LoRa, set the iPol value
if txInfo.Modulation == common.Modulation_LORA {
modInfo := txInfo.GetLoraModulationInfo()
if modInfo != nil {
modInfo.PolarizationInversion = ctx.IPol
}
}
df := gw.DownlinkFrame{
Token: uint32(token),
DownlinkId: downID[:],
GatewayId: mac[:],
Items: []*gw.DownlinkFrameItem{
{
TxInfo: &txInfo,
PhyPayload: phyB,
},
},
}
ctx.DownlinkFrames = append(ctx.DownlinkFrames, df)
if err := gateway.Backend().SendTXPacket(df); err != nil {
return errors.Wrap(err, "send downlink frame to gateway error")
}
}
return nil
}
func saveDownlinkFrames(ctx *proprietaryContext) error {
for _, df := range ctx.DownlinkFrames {
if err := storage.SaveDownlinkFrame(ctx.ctx, &storage.DownlinkFrame{
Token: df.Token,
DownlinkFrame: &df,
}); err != nil {
return errors.Wrap(err, "save downlink-frame error")
}
}
return nil
}