arduino-lorawan
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20 hours ago •
mcci-catena
mcci-catena
Getting state save/restore to work? NetSaveSessionInfo/NetSaveSessionState/NetGetSessionState/GetAbpProvisioningInfo/GetProvisioningStyle
I'm not having much luck getting session save/restore to work.
Multiple examples show that you need to implement NetSaveSessionInfo/NetSaveSessionState/NetGetSessionState.
Based on issue #165 I also added GetAbpProvisioningInfo. When that wasn't actually being called I overrode GetProvisioningStyle to check for a saved session and return ProvisioningStyle::kABP.
At the moment I am using EEPROM as a placeholder. I know it will have endurance problems and once I get it working will switch to storing it in sram on a 2nd mcu acting as an i2c slave (that also acts as a watchdog).
The SessionState gets stored starting at EEPROM address 0. The SessionInfo gets stored starting at EEPROM address sizeof(SessionState):
bool
cMyLoRaWAN::GetOtaaProvisioningInfo(
OtaaProvisioningInfo *pInfo
) {
Serial.println("GetOtaaProvisioningInfo");
memcpy(pInfo->DevEUI, DEVEUI,8);
memcpy(pInfo->AppEUI, APPEUI,8);
memcpy(pInfo->AppKey, APPKEY,16);
return true;
}
bool cMyLoRaWAN::GetAbpProvisioningInfo(
Arduino_LoRaWAN::AbpProvisioningInfo *pInfo
){
SessionInfo si;
SessionState ss;
Serial.println("GetAbpProvisioningInfo:");
Serial.print("Loading SessionInfo:");
uint8_t * pb = (uint8_t *) &si;
for(int i=0; i<sizeof(SessionInfo); i++){
pb[i]=EEPROM.read(sizeof(SessionState)+i);
printHex2(pb[i]);
}
Serial.println("");
if(si.Header.Tag != kSessionInfoTag_V2){
Serial.print("SessionInfo from EEPROM has tag: ");
Serial.print(si.Header.Tag);
Serial.println(" aborting restore.");
return(false);
}
this->NetGetSessionState(ss);
if(ss.Header.Tag != kSessionStateTag_V1){
Serial.print("SessionState from EEPROM has tag: ");
Serial.print(si.Header.Tag);
Serial.println(" aborting restore.");
return(false);
}
pInfo->NetID = si.V2.NetID;
pInfo->DevAddr = si.V2.DevAddr;
memcpy(pInfo->NwkSKey, si.V2.NwkSKey, 16);
memcpy(pInfo->AppSKey, si.V2.AppSKey, 16);
pInfo->FCntUp=ss.V1.FCntUp;
pInfo->FCntDown=ss.V1.FCntDown;
return true;
}
void
cMyLoRaWAN::NetSaveSessionInfo(
const SessionInfo &Info,
const uint8_t *pExtraInfo,
size_t nExtraInfo
) {
// save Info somewhere.
const uint8_t * pb = (uint8_t *) (&Info);
Serial.print("NSSI: ");
for(int i=0; i<sizeof(SessionInfo); i++){
EEPROM.write(sizeof(SessionState)+i, pb[i]);
printHex2(pb[i]);
}
Serial.print(" exI: ");
for(int i=0; i<nExtraInfo; i++){
EEPROM.write(sizeof(SessionState)+sizeof(SessionInfo)+i, pExtraInfo[i]);
printHex2(pExtraInfo[i]);
}
Serial.println();
EEPROM.commit();
Serial.print("Saved SI ");
Serial.print(sizeof(SessionInfo) + nExtraInfo);
Serial.println(" Bytes.");
}
void
cMyLoRaWAN::NetSaveSessionState(const SessionState &State) {
// save State somwwhere. Note that it's often the same;
// often only the frame counters change.
Serial.print("NSSS: ");
const uint8_t * pb = (uint8_t *) (&State);
for(int i=0; i<sizeof(SessionState); i++){
EEPROM.write(i, pb[i]);
printHex2(pb[i]);
}
Serial.println("");
Serial.print("Saved SS ");
Serial.print(sizeof(SessionState));
Serial.println(" Bytes.");
EEPROM.commit();
}
Arduino_LoRaWAN::ProvisioningStyle cMyLoRaWAN::GetProvisioningStyle(void){
uint8_t tag = EEPROM.read(sizeof(SessionState)+0);
if(tag == kSessionInfoTag_V2){
Serial.println("Have a SessionInfo, ABP");
return Arduino_LoRaWAN::ProvisioningStyle::kABP;
}
Serial.println("No SessionInfo, OTAA");
return Arduino_LoRaWAN::ProvisioningStyle::kOTAA;
}
bool
cMyLoRaWAN::NetGetSessionState(SessionState &State) {
Serial.print("NGSS: ");
// either fetch SessionState from somewhere and return true or...
uint8_t * pb = (uint8_t *) (&State);
for(int i=0; i<sizeof(SessionState); i++){
pb[i]=EEPROM.read(i);
printHex2(pb[i]);
}
Serial.println("");
return true;
}
Here is the output from the first boot with the EEPROM cleared:
eeprom cleared
BOOTING....
NGSS: 000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
No SessionInfo, OTAA
No SessionInfo, OTAA
Packet queued
NSSS: 01D802000000000000000000000000004D19FBFFA0700837A0700837000080FF14000000080100000A000000011600FF000000000000020000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
Saved SS 216 Bytes.
NSSI: 02340000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 exI:
Saved SI 52 Bytes.
NSSS: 01D8020000000000000000000000000062FCFAFFA0700837A0700837000080FF15000000080100000A000000011600FF000000000000020000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
Saved SS 216 Bytes.
331357: EV_JOINING
GetOtaaProvisioningInfo
GetOtaaProvisioningInfo
GetOtaaProvisioningInfo
GetOtaaProvisioningInfo
GetOtaaProvisioningInfo
GetOtaaProvisioningInfo
GetOtaaProvisioningInfo
NSSI: 023400004865320026000048F22C117AD48428A5691BCF974A225B60AE076996F3F9DB1ADE315B7B5D647075301DFB3F00000000 exI:
Saved SI 52 Bytes.
NSSS: 01D8020000000000000000000000000029B8F5FFA0700837A0700837000080FF15000000080100000A000000011600FF000000000000020000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
Saved SS 216 Bytes.
682414: EV_JOINED
netid: 3302728
devaddr: 48000026
AppSKey: AE-07-69-96-F3-F9-DB-1A-DE-31-5B-7B-5D-64-70-75
NwkSKey: F2-2C-11-7A-D4-84-28-A5-69-1B-CF-97-4A-22-5B-60
NSSS: 01D802000000000000000000000000006B95F5FFA0700837A0700837000080FF15000000080100000A000000011600FF000000000000020000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
Saved SS 216 Bytes.
686013: EV_TXCOMPLETE (includes waiting for RX windows)
5302 ms: TX: ch=8 rps=0x04 (SF10 BW125 CR 4/5 Crc IH=0)
Packet queued
NSSS: 01D80201010000000100000000000000127A0000A0700837A0700837000080FF15000000080100000A000000011600FF000000000000020000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
Saved SS 216 Bytes.
NSSS: 01D8020101000000010000000000000078630000A0700837A0700837000080FF15000000080100000A000000011600FF000000000000020000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
Saved SS 216 Bytes.
4523406: EV_TXCOMPLETE (includes waiting for RX windows)
NSSS: 01D80201020000000100000000000000117A0000A0700837A0700837000080FF15000000080100000A000000011600FF000000000000020000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
Saved SS 216 Bytes.
4687540: EV_TXCOMPLETE (includes waiting for RX windows)
70977 ms: TX: ch=13 rps=0x03 (SF9 BW125 CR 4/5 Crc IH=0)
72727 ms: TX: ch=15 rps=0x03 (SF9 BW125 CR 4/5 Crc IH=0)
Here is the reboot,
01234BOOTING....
NGSS: 01D80201020000000100000000000000117A0000A0700837A0700837000080FF15000000080100000A000000011600FF000000000000020000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
Have a SessionInfo, ABP
Have a SessionInfo, ABP
GetAbpProvisioningInfo:
Loading SessionInfo:023400004865320026000048F22C117AD48428A5691BCF974A225B60AE076996F3F9DB1ADE315B7B5D647075301DFB3F00000000
NGSS: 01D80201020000000100000000000000117A0000A0700837A0700837000080FF15000000080100000A000000011600FF000000000000020000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
Packet queued
NSSS: 01D802000000000000000000000000005A0CFBFFA0700837A0700837000080FF14000000080100000A000000011600FF000000000000020000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
Saved SS 216 Bytes.
NSSI: 02340000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 exI:
Saved SI 52 Bytes.
NSSS: 01D802000000000000000000000000009DE3FAFFA0700837A0700837000080FF15000000080100000A000000011600FF000000000000020000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
Saved SS 216 Bytes.
337701: EV_JOINING
GetOtaaProvisioningInfo
GetOtaaProvisioningInfo
GetOtaaProvisioningInfo
GetOtaaProvisioningInfo
GetOtaaProvisioningInfo
GetOtaaProvisioningInfo
GetOtaaProvisioningInfo
NSSI: 023400004865320027000048CE118DD36177D3F1517C03781D38C79098B2F48C0DD0B9D80183B7C84E1707AB901EFB3FD702FC3F exI:
Saved SI 52 Bytes.
NSSS: 01D80200000000000000000000000000ED93F5FFA0700837A0700837000080FF15000000080100000A000000011600FF000000000000020000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
Saved SS 216 Bytes.
685906: EV_JOINED
netid: 3302728
devaddr: 48000027
AppSKey: 98-B2-F4-8C-0D-D0-B9-D8-01-83-B7-C8-4E-17-07-AB
NwkSKey: CE-11-8D-D3-61-77-D3-F1-51-7C-03-78-1D-38-C7-90
NSSS: 01D80200000000000000000000000000C887F5FFA0700837A0700837000080FF15000000080100000A000000011600FF000000000000020000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
Saved SS 216 Bytes.
689500: EV_TXCOMPLETE (includes waiting for RX windows)
5404 ms: TX: ch=8 rps=0x04 (SF10 BW125 CR 4/5 Crc IH=0)
You can see it does a rejoin and gets a new AppSKey/NwkSKey
What am I doing wrong? Any chance a fixed version of this could be added as an example?
in case anyone else is stuck on this:
while I still can't get the convoluted NetGetSessionState flow to work, the underlying arduino-lmic library has a far simpler to use set of functions that work fine.
The following example code works (and will wear out eeprom if used as below)
typedef struct{
uint32_t seqnoUp;
uint32_t netid;
devaddr_t devaddr;
uint8_t nwkKey[16];
uint8_t artKey[16];
} eep_sstate_t;
void store_joininfo(u4_t netid, devaddr_t devaddr, uint8_t *nwkKey, uint8_t *artKey){
eep_sstate_t st;
st.seqnoUp=LMIC_getSeqnoUp();
st.netid=netid;
st.devaddr=devaddr;
memcpy(st.nwkKey,nwkKey,16);
memcpy(st.artKey,artKey,16);
uint8_t *r = (uint8_t*)&st;
for(int i=0; i<sizeof(eep_sstate_t); i++){
EEPROM.write(i,r[i]);
}
EEPROM.commit();
}
bool eep_rejoin(){
eep_sstate_t st;
uint8_t *r = (uint8_t*)&st;
for(int i=0; i<sizeof(eep_sstate_t); i++){
r[i]=EEPROM.read(i);
}
if(st.netid == 0xFFFFFFFF || st.netid == 0x0){
Serial.println("no session in EEPROM");
return false;
}
LMIC_reset();
LMIC_setSession(st.netid, st.devaddr, st.nwkKey, st.artKey);
LMIC_setSeqnoUp(st.seqnoUp);
return(true);
}
and then in onEvent:
and then in onEvent:
case EV_JOINED:
...
store_joininfo(netid,devaddr,nwkKey,artKey);
case EV_TXCOMPLETE:
...
uint32_t su = LMIC_getSeqnoUp();
uint8_t *sup = (uint8_t*)&su;
EEPROM.write(0,sup[0]);
EEPROM.write(1,sup[1]);
EEPROM.write(2,sup[2]);
EEPROM.write(3,sup[3]);
EEPROM.commit();
and finally call eep_rejoin(); at startup.
Also, the state this way is 44 bytes instead of far more.