Ledger onSync constantly being called after reconnect

Cloud
1

Hi,

I’m trying out the Ledger system and have create three Ledgers at each scope level. I’ve attached the three ledgers to an onSync callback If I Update an Instance in the cloud and the device connects the callback is called as expected.

However If I then disconnect and sleep the device and then wake and reconnect the callback is called again, but I have not changed the ledger in the cloud.

If I reset the device then the callback is not called after it connects (and if I make a change it is called).

Is there something that I need to do when I disconnect to tell it that the current Ledger is current and don’t need to update? Below are the log output and extracts of the code I’m using.

0000650240|cloud|INFO|Connectivity status: CONNECTED
0000650241|comm.coap|TRACE|Received CoAP message
0000650241|comm.coap|TRACE|CON POST /E/particle/device/updates/pending size=47 token=01 id=50899
0000650243|comm.coap|TRACE|Sending CoAP message
0000650243|comm.coap|TRACE|ACK 0.00 size=4 token= id=50899
0000650247|comm.coap|TRACE|Received CoAP message
0000650248|comm.coap|TRACE|ACK 0.00 size=4 token= id=190
0000650685|comm.coap|TRACE|Received CoAP message
0000650685|comm.coap|TRACE|ACK 2.04 size=35 token=4e id=191
0000650963|messages|INFO|Cloud ledger synced [monitor-device]*

void CloudHandler::setup(int (*callback)(String)) {
    bool success = Particle.function("callback", callback);
    if (!success) lg(log,log_msg_failed_callback);
    _dataLedger_device = Particle.ledger("monitor-device");
    _dataLedger_product = Particle.ledger("monitor-product");
    _dataLedger_global = Particle.ledger("monitor-global");
    _dataLedger_device.onSync([](Ledger ledger, void* arg) {
        MessageManager::instance().notifyCloudLedgerSynced(ledger);
    });
    _dataLedger_product.onSync([](Ledger ledger, void* arg) {
        MessageManager::instance().notifyCloudLedgerSynced(ledger);
    });
    _dataLedger_global.onSync([](Ledger ledger, void* arg) {
        MessageManager::instance().notifyCloudLedgerSynced(ledger);
    });
    if (_dataLedger_device.isValid()) {
        lg(log,"Device Ledger is valid last update %llu, last synced %llu",_dataLedger_device.lastUpdated(),_dataLedger_device.lastSynced());
    } else {
        lg(warn,"Device Ledger is not valid");
    }
    if (_dataLedger_product.isValid()) {
        lg(log,"Product Ledger is valid last update %llu, last synced %llu",_dataLedger_product.lastUpdated(),_dataLedger_product.lastSynced());
    } else {
        lg(warn,"Product Ledger is not valid");
    }
    if (_dataLedger_global.isValid()) {
        lg(log,"Global Ledger is valid last update %llu, last synced %llu",_dataLedger_global.lastUpdated(),_dataLedger_global.lastSynced());
    } else {
        lg(warn,"Global Ledger is not valid");
    }
}

void MessageManager::notifyCloudLedgerSynced(Ledger ledger) {
  lg(info,"*******************Cloud ledger synced [%s]********************", ledger.name());

  LedgerData data = ledger.get();
  for (const LedgerData::Entry& entry: data.entries()) {
     const String& name = entry.first;
     const Variant& value = entry.second;
     Log.info("%s: %s", name.c_str(), value.toString().c_str());
  }
}

void CloudHandler::connect() {
    lg(log,log_msg_connection, "Cloud");
    Particle.connect();
    waitFor(Particle.connected, 20000);
    connectivityState = TM_CONNECTING;
}

void CloudHandler::disconnect() {
    Particle.disconnect(CloudDisconnectOptions().graceful(true).timeout(20s));
    waitFor(Particle.disconnected, 20000);
    lg(info,log_msg_cloud_turn_off);
    Cellular.disconnect();
    Cellular.off();
    waitFor(Cellular.isOff, 20000);
    lg(info,log_msg_modem_is_off);
    connectivityState = TM_NOT_CONNECTED;
}
2

I am wondering if all three of your ledger instances are being created with the same name, “ledger”, instead of unique names, such as: “ledger1”, “ledger2” & “ledger3” for example. The .onSync() statement should synchronize only one particular Ledger after connection but it looks to me that all of them: “.onSync([](Ledger ledger,” - name an identical instance. Hope this helps.

3

Not sure I understand what you mean. I’ve created 3 Seperate ledger variables with 3 seperate ledger names so they all should be seperate. I can see from the output that each ledger calls the onsync correctly when I update the ledgers in the cloud. Just that it continually calls it whenever I re connect to the cloud. So if I only update 1 ledger then that ledger is called again and again on reconnect, but if I update 2 or 3 ledgers then both or all three are called again and again.