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esp32-ogn-tracker
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esp32-ogn-tracker/main/lorawan.h

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11 KiB
C++
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#ifndef __LORAWAN_H__
#define __LORAWAN_H__
#include <stdint.h>
#ifdef WITH_ESP32
#include "nvs.h"
#endif
#include "LoRaMacCrypto.h"
#include "rfm.h"
class LoRaWANnode
{ public:
static const uint8_t Chans=8;
uint64_t AppEUI; // from application registration: Application identification
uint8_t AppKey[16]; // from device registration: application encryption/decryption key
uint64_t DevEUI; // Device identification (MAC)
uint32_t DevNonce; // unique counter kept by the device for Join-Requests
uint8_t NetSesKey[16]; // from Join-Accept: Network Session Key
uint8_t AppSesKey[16]; // from Join-Accept: App Session Key
uint32_t JoinNonce; // from Join-Accept: unique must not be reused
uint32_t HomeNetID; // from Join-Accept: Home Network ID
uint32_t DevAddr; // from Join-Accept: Device Address
uint8_t DLsetting; // from Join-Accept: DownLink configuration: OptNeg | RX1DRoffset | RX2 data rate
uint8_t RxDelay; // from Join-Accept:
uint8_t State; // 0:disconencted, 1:join-request sent, 2:join-accept received
uint8_t Chan; // [0..7] Current channel being used
uint32_t UpCount; // [seq] Uplink frame counter: reset when joining the network
uint32_t DnCount; // [seq] Downlink frame counter: reset when joining the network
uint32_t TxCount; // [packets] transmitted to the network
uint32_t LastTx; // [sec] last transmission
uint32_t RxCount; // [packets] received from the network
uint32_t LastRx; // [sec] when last heard from the network
uint8_t RxSNR; // SNR on receive
int8_t RxRSSI; // [dBm] signal strength
union
{ uint8_t Flags;
struct
{ bool RxACK :1; // received ACK
bool TxACK :1; // ACK to be transmitted
bool RxPend:1; // more frames pending for reception
} ;
} ;
uint8_t Spare;
uint8_t Packet[40]; // generic packet for storage/processing
public:
LoRaWANnode() { Reset(); }
void Reset(void)
{ State=0; DevNonce=0; JoinNonce=0;
LastTx=0; TxCount=0; LastRx=0; RxCount=0; Flags=0; }
void Reset(uint64_t MAC, uint8_t *AppKey=0)
{ AppEUI=0x70B3D57ED0035895;
DevEUI=MAC;
if(AppKey) memcpy(this->AppKey, AppKey, 16);
Reset(); }
uint8_t incrChan(uint8_t Step=1) { Chan+=Step; if(Chan>=Chans) Chan-=Chans; return Chan; }
int Save(FILE *File) { return fwrite(this, sizeof(LoRaWANnode), 1, File); }
int Save(const char *FileName)
{ FILE *File=fopen(FileName, "wb"); if(File==0) return 0;
int Written=Save(File); fclose(File); return Written; }
int Restore(FILE *File) { return fread(this, sizeof(LoRaWANnode), 1, File); }
int Restore(const char *FileName)
{ FILE *File=fopen(FileName, "rb"); if(File==0) return 0;
int Read=Restore(File); fclose(File); return Read; }
static int ReadHex(uint8_t *Data, int Len, const char *Inp)
{ int Bytes=0;
for( ; Bytes<Len; )
{ int8_t H = Read_Hex1(*Inp++); if(H<0) break;
int8_t L = Read_Hex1(*Inp++); if(L<0) break;
Data[Bytes++] = (H<<4) | L; }
return Bytes; }
// int readAppEUI(const char *Inp) { return ReadHex(&AppEUI, 8, Inp); }
int readAppKey(const char *Inp) { return ReadHex(AppKey,16, Inp); }
// int readDevEUI(const char *Inp) { return ReadHex(&DevEUI, 8, Inp); }
template<class Type>
static Type readInt(const uint8_t *Inp, int Len=sizeof(Type))
{ int Idx=Len-1;
Type Value = Inp[Idx];
for( ; Idx>0; )
{ Idx--; Value<<=8; Value|=Inp[Idx]; }
return Value; }
template<class Type>
static int writeInt(uint8_t *Out, Type Value, int Len=sizeof(Type), bool Rev=0)
{ if(Rev)
{ for( int Idx=Len; Idx>0; )
{ Out[--Idx] = Value; Value>>=8; }
}
else
{ for(int Idx=0; Idx<Len; )
{ Out[Idx++] = Value; Value>>=8; }
}
return Len; }
int getJoinRequest(uint8_t *Req)
{ Req[0] = 0x00; // MHDR, Join-Request: 000 000 00
memcpy(Req+1, &AppEUI, 8); //
memcpy(Req+9, &DevEUI, 8);
Req[17] = DevNonce;
Req[18] = DevNonce>>8;
uint32_t MIC=0;
LoRaMacJoinComputeMic(Req, 19, AppKey, &MIC); // compute MIC
memcpy(Req+19, &MIC, 4); // append MIC
State=1; // State: Join-Request sent
return 23; } // 23 bytes packet length
int getJoinRequest(uint8_t **Req) { int Len=getJoinRequest(Packet); *Req = Packet; return Len; }
int procJoinAccept(const RFM_LoRa_RxPacket &RxPacket)
{ int Ret=procJoinAccept(RxPacket.Byte, RxPacket.Len); if(Ret<0) return Ret;
RxSNR = RxPacket.SNR;
RxRSSI = RxPacket.RSSI;
return Ret; }
int procJoinAccept(const uint8_t *PktData, int PktLen)
{ if(PktLen<13) return -1;
uint8_t Type = PktData[0]>>5; if(Type!=1) return -1;
Packet[0] = PktData[0];
LoRaMacJoinDecrypt(PktData+1, PktLen-1, AppKey, Packet+1); // decrypt the Join-Accept packet
uint32_t MIC=0;
LoRaMacJoinComputeMic(Packet, PktLen-4, AppKey, &MIC); // Compute MIC
if(memcmp( Packet+PktLen-4, &MIC, 4)) return -1; // Compare with the packet
LoRaMacJoinComputeSKeys(AppKey, Packet+1, DevNonce, NetSesKey, AppSesKey); // derive Network Session and Application Session keys
JoinNonce = readInt<uint32_t>(Packet+1, 3); // this should be not smaller than the previous one
HomeNetID = readInt<uint32_t>(Packet+4, 3);
DevAddr = readInt<uint32_t>(Packet+7, 4);
DLsetting = Packet[11];
RxDelay = Packet[12];
State = 2; // State = accepted on network
UpCount = 0;
DnCount = 0;
#ifdef WITH_PRINTF
printf("Accept[%d] ", PktLen-4);
for(int Idx=0; Idx<PktLen-4; Idx++)
printf("%02X", Packet[Idx]);
printf(" HomeNetID:%06X, DevAddr:%08X, DL:%02X, RxDelay:%02X\n", HomeNetID, DevAddr, DLsetting, RxDelay);
printf("NetSesKey: "); PrintHex(NetSesKey, 16); printf("\n");
printf("AppSesKey: "); PrintHex(AppSesKey, 16); printf("\n");
#endif
return 0; }
int getDataPacket(uint8_t *Packet, const uint8_t *Data, int DataLen, uint8_t Port=1, bool Confirm=0)
{ uint8_t Type = Confirm?0x04:0x02;
int PktLen=0;
Packet[PktLen++] = Type<<5; // packet-type
PktLen+=writeInt(Packet+PktLen, DevAddr, 4); // Device Address
uint8_t Ctrl=0;
if(TxACK) { Ctrl|=0x20; TxACK=0; }
Packet[PktLen++] = Ctrl; // Frame Control: ADR | ADR-ACK-Req | ACK | ClassB | FOptsLen[4]
PktLen+=writeInt(Packet+PktLen, UpCount, 2); // uplink frame counter
Packet[PktLen++] = Port; // port
LoRaMacPayloadEncrypt(Data, DataLen, AppSesKey, DevAddr, 0, UpCount, Packet+PktLen); PktLen+=DataLen; // copy+encrypt user data
uint32_t MIC=0;
LoRaMacComputeMic(Packet, PktLen, NetSesKey, DevAddr, 0x00, UpCount, &MIC); // calc. MIC
// uint8_t MIC2[4];
// Tiny.Calculate_MIC(Packet, MIC2, PktLen, UpCount, 0x00);
// printf("Data packet MIC: %08X <=> %02X%02X%02X%02X\n", MIC, MIC2[3], MIC2[2], MIC2[1], MIC2[0]);
memcpy(Packet+PktLen, &MIC, 4); PktLen+=4; // append MIC
UpCount++; return PktLen; }
int getDataPacket(uint8_t **Pkt, const uint8_t *Data, int DataLen, uint8_t Port=1, bool Confirm=0)
{ int Len=getDataPacket(Packet, Data, DataLen, Port, Confirm); *Pkt = Packet; return Len; }
int procRxData(const RFM_LoRa_RxPacket &RxPacket)
{ int Ret=procRxData(RxPacket.Byte, RxPacket.Len); if(Ret<0) return Ret;
RxSNR += (RxPacket.SNR-RxSNR+1)/2;
RxRSSI += (RxPacket.RSSI-RxRSSI+1)/2;
return Ret; }
int procRxData(const uint8_t *PktData, int PktLen)
{ if(PktLen<12) return -1;
uint8_t Type = PktData[0]>>5; if(Type!=3 && Type!=5) return -1;
uint32_t Addr=readInt<uint32_t>(PktData+1, 4);
if(Addr!=DevAddr) return 0;
uint8_t Ctrl = PktData[5]; // Frame control: ADR | RFU | ACK | FPending | FOptLen[4]
uint32_t Count=readInt<uint32_t>(PktData+6, 2);
// Count |= DnCount&0xFFFF0000;
int16_t CountDiff = Count-DnCount; //
if(CountDiff<=0) return -1; // attempt to reuse the counter: drop this packet
// if(Diff<=(-0x4000)) Count+=0x10000;
// else if(Diff>0x4000) Count-=0x10000;
// printf("RxData: %08X\n", Count);
uint32_t MIC=0;
LoRaMacComputeMic(PktData, PktLen-4, NetSesKey, Addr, 0x01, Count, &MIC);
// printf("RxData: %08X\n", MIC);
if(memcmp(PktData+PktLen-4, &MIC, 4)) return -1; // give up if MIC does not match
// if(Count==DnCount) return 0;
uint8_t DataOfs = 8 + (Ctrl&0x0F); // where the port byte should be
uint8_t DataLen = PktLen-DataOfs-4; // number of bytes of the user data field
if(DataLen) // if non-zero
{ Packet[0] = PktData[DataOfs]; // copy port number
LoRaMacPayloadDecrypt(PktData+DataOfs+1, DataLen-1, AppSesKey, Addr, 0x01, Count, Packet+1); } // decrypt and copy the user data
#ifdef WITH_PRINTF
printf("RxData: [%d] ", DataLen);
for(int Idx=0; Idx<DataLen; Idx++)
printf("%02X", Packet[Idx]);
printf("\n");
#endif
DnCount += CountDiff; // update the download sequence counter
if(Ctrl&0x40) RxACK=1; // we got ACK to our ACK request
if(Type==5) TxACK=1; // if ACK requested
RxPend = Ctrl&0x10; // is there more data pending to be received on next round ?
return DataLen; }
#ifdef WITH_ESP32
esp_err_t WriteToNVS(const char *Name="LoRaWAN", const char *NameSpace="TRACKER")
{ nvs_handle Handle;
esp_err_t Err = nvs_open(NameSpace, NVS_READWRITE, &Handle);
if(Err!=ESP_OK) return Err;
Err = nvs_set_blob(Handle, Name, this, sizeof(LoRaWANnode)-40);
if(Err==ESP_OK) Err = nvs_commit(Handle);
nvs_close(Handle);
return Err; }
esp_err_t ReadFromNVS(const char *Name="LoRaWAN", const char *NameSpace="TRACKER")
{ nvs_handle Handle;
esp_err_t Err = nvs_open(NameSpace, NVS_READWRITE, &Handle);
if(Err!=ESP_OK) return Err;
size_t Size=0;
Err = nvs_get_blob(Handle, Name, 0, &Size); // get the Size of the blob in the Flash
if( (Err==ESP_OK) && (Size<=(sizeof(LoRaWANnode)-40)) )
Err = nvs_get_blob(Handle, Name, this, &Size); // read the Blob from the Flash
nvs_close(Handle);
return Err; }
#endif // WITH_ESP32
} ;
#endif // __LORAWAN_H__
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