LoRaWAN node.saveSession (v 6.5.0)

[michapr]

Hi,

thank you for the new version!

Can you please describe how the node.Savesession / restore is working now?
I have seen that node.beginOTAA() will now try to restore the session - but for my Heltec WSL866 (ESP32S3) it is not working more.

Have added in the "LoRaWAN_Reference.ino" this block before the loop delay

      state = node.saveSession();
      if(state == RADIOLIB_ERR_NONE) {
      Serial.println(F("save success!"));
    } else {
      Serial.print(F("save failed, code "));
      Serial.println(state);
    }

get a "save success" - but after reset it looks like that will not restore more the session (new join in TTN console).

19:45:40.024 -> RLB_DBG: M	SX126x
19:45:40.056 -> Join ('login') to the LoRaWAN Network
19:45:40.056 -> RLB_PRO: Configuration mismatch (checksum: 0, mode: 0, class: 0, plan: 1)
19:45:40.056 -> RLB_PRO: Nonces buffer:
19:45:40.056 -> RLB_PRO: 0000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | ................
19:45:40.056 -> RLB_PRO: Clearing buffer and starting fresh
19:45:40.056 -> RLB_PRO: Setting up dynamic channels

I think I do something wrong with new version...

Thanks!

[StevenCellist]

Please take a look at the persistence library to see how to save a session. You will see that you should not call saveSession() anymore, but use the getBufferNonces() and getBufferSession(), each with some extra required logic, and you can restore the session with setBufferNonces() and setBufferSession(). But it's all explained in the code there.

[michapr]

Thanks!
Haven't seen this example - was checking the files only in LoRaWAN directory... (and I apparently ignored the readme...)

[HeadBoffin]

We are hoping that there should be some stability but please please check out the README in the LoRaWAN examples folder: https://github.com/jgromes/RadioLib/blob/master/examples/LoRaWAN/README.md.

We'll figure out a way of incorporating release notes and copy them on to the wiki. It will need a few of us to deploy some devices that are left to run for a while before we can declare the API stable, but we are travelling hopeful.

[tanguy-e]

I have quite the same problem. This program worked fine until 6.5.0 version :

#include <RadioLib.h>
#include <Wire.h>
#include <Adafruit_BMP280.h>
#include <CayenneLPP.h>

SX1262 radio = new Module(8, 14, 12, 13);
LoRaWANNode node(&radio, &EU868);

Adafruit_BMP280 bmp;
CayenneLPP lpp(51);

void setup() {
  Serial.begin(112500);

  unsigned status;
  status = bmp.begin(BMP280_ADDRESS_ALT, BMP280_CHIPID);
  if (!status) {
    Serial.println(F("Could not find a valid BMP280 sensor, check wiring or "
                     "try a different address!"));
  }
  bmp.setSampling(Adafruit_BMP280::MODE_NORMAL,
                  Adafruit_BMP280::SAMPLING_X2,
                  Adafruit_BMP280::SAMPLING_X16,
                  Adafruit_BMP280::FILTER_X16,
                  Adafruit_BMP280::STANDBY_MS_500);

  int state = radio.begin();
  if(state == RADIOLIB_ERR_NONE) {
    Serial.println(F("success!"));
  } else {
    Serial.print(F("failed, code "));
    Serial.println(state);
    while(true);
  }
    
  uint64_t joinEUI = 0x0000000000000000;
  uint64_t devEUI = 0x70B3D57ED006522D;

  uint8_t nwkKey[] = { 0x95, 0xAC, 0x48, 0x4C, 0x0B, 0x6C, 0xA1, 0x99, 0xF8, 0x03, 0x11, 0xCA, 0xDA, 0xA7, 0x74, 0xC1 };
  uint8_t appKey[] = { 0xF5, 0xD8, 0x93, 0x27, 0x8F, 0x7E, 0x3F, 0x23, 0xC3, 0xDA, 0xB5, 0xA1, 0x9A, 0xE0, 0xCD, 0x6C };

  Serial.print(F("[LoRaWAN] Tentative de connexion OTAA ... "));
  state = node.beginOTAA(joinEUI, devEUI, nwkKey, appKey);

  if(state >= RADIOLIB_ERR_NONE) {
    Serial.println(F("Connexion!"));
    delay(2000);
  } else {
    Serial.print(F("Echoué, code "));
    Serial.println(state);
    while(true);
  }
}

void loop() {
  char str[30];
  float temperature = bmp.readTemperature();
  float pressure = (bmp.readPressure()/100.0);

  sprintf(str,"Température : %.1f °C",temperature);
  Serial.println();
  Serial.println(str);
  sprintf(str,"Pression : %.1f hPa",pressure);
  Serial.println(str);
  
  lpp.reset();

  lpp.addTemperature(1, temperature);
  lpp.addBarometricPressure(2, pressure);

  byte packet[lpp.getSize()];
  lpp.copy(packet);

  Serial.print("Octets envoyés : ");
  Serial.println(lpp.getSize());

  Serial.print("Trame envoyée : ");
  uint8_t *payload = lpp.getBuffer();

  for (unsigned char i = 0; i < lpp.getSize(); i++)
  {
    Serial.print("0x");
    Serial.print(payload[i], HEX);
    Serial.print(" ");
  }
  Serial.println();

  Serial.println(F("[LoRaWAN] En train d'envoyer la trame ... "));
  int state = node.uplink(lpp.getBuffer(), lpp.getSize(), 10);
    String strDown;

  if(state != RADIOLIB_ERR_NONE) {
    Serial.println(F("Erreur d'envoi!"));
  }

  state = node.downlink(strDown);

  if(state == RADIOLIB_ERR_NONE) {
    Serial.println(F("Réception reçue!"));

    Serial.println(F("[LoRaWAN] Data:\t\t"));
    if(strDown.length() > 0) {
      Serial.print("Message reçu : ");
      Serial.println(strDown);
    } else {
      Serial.println(F("<MAC commands only>"));
      Serial.println(strDown);
    }

    Serial.print(F("[LoRaWAN] RSSI:\t\t"));
    Serial.print(radio.getRSSI());

    Serial.println(F(" dBm"));

    Serial.print(F("[LoRaWAN] SNR:\t\t"));
    Serial.print(radio.getSNR());
    Serial.println(F(" dB"));

    Serial.print(F("[LoRaWAN] Frequency error:\t"));
    Serial.print(radio.getFrequencyError());
    Serial.println(F(" Hz"));

  } else if(state == RADIOLIB_ERR_RX_TIMEOUT) {
    Serial.println(F("Pas de réception!"));

  } else {
    Serial.print(F("failed, code "));
    Serial.println(state);
  }

  node.saveSession();
  
  uint32_t minimumDelay = 60000;
  uint32_t interval = node.timeUntilUplink();
  uint32_t delayMs = max(interval, minimumDelay);

  delay(delayMs);
}

I'm not sure to understand how to modify it and make it work again without having to rewrite all ?
Thanks

[StevenCellist]

Please read the two comments above your post- RadioLib changed notably between 6.4 and 6.5.
A (partly) rewrite seems quite necessary.

[HeadBoffin]

I'm not sure to understand how to modify it and make it work again without having to rewrite all ?

Take the persistent version provided and copy & paste the code you inserted in to the previous example in to the new version. No "rewrite all" is required but as you implemented beta software, this sort of upgrade comes with the territory.