MQTT delete topic doesn't work

[bad-gargoyle]

"status" topic and "learn" topic are working fine, but when I try to use "delete" topic, nothing happens (fingerprintId is still in sensor database).

Topic is: /fingerprint/espfingscan1/delete
Payload sended:
{
"fingerprintId":10
}

Please help.

[vinz486]

Are you sure about the id? Maybe you recorded multiple times with same id?

[bad-gargoyle]

Yes, I've checked via "TestDemo_V3.012" (app for testing R503) - application is showing that recorded id's are 10 and 11.
What do you mean by saying "Maybe you recorded multiple times with same id". That is possible, but as I see it, new finger record should overwrite the previous one.

[vinz486]

So, deleting 10 and 11 is not working?

[bad-gargoyle]

Unfortunately yes, but have in mind that those are only one recorded for now. So you may say that it doesn't work for any recorded ID's. You think that I should try to make records for other ID's and check, let's say, range of the problem?

[bad-gargoyle]

And one more thing. I can ofcourse with success delete those ID's using "TestDemo_V3.012" (app for testing R503). ;-)

[vinz486]

Never had this issue with my sensors.

[bad-gargoyle]

It's not an sesnsors issue. In "setup.cpp" I think there is an error in this part of code (some prints added from my side to visualize problem):

void mqttConnect()
{
    if (!client.connected() && loopDelay(DELAY_CONNECT, 5000))
    {
        String topic;

        topic = "/fingerprint/";
        topic.concat(deviceGateId);
        topic.concat("/delete");
        deleteTopic[topic.length() + 1];
        topic.toCharArray(deleteTopic, topic.length() + 1);
        Serial.print("Delete topic: ");
        Serial.println(deleteTopic);

        topic = "/fingerprint/";
        topic.concat(deviceGateId);
        topic.concat("/learn");
Serial.printf("Test... deleteTopic %s\n", deleteTopic);
        learnTopic[topic.length() + 1];
        // char learnTopic[topic.length() + 1];
Serial.printf("Test... deleteTopic %s\n", deleteTopic);
        topic.toCharArray(learnTopic, topic.length() + 1);
Serial.printf("Test... deleteTopic %s\n", deleteTopic);
        Serial.print("Learn topic: ");
        Serial.println(learnTopic);

        topic = "/fingerprint/";
        topic.concat(deviceGateId);
        topic.concat("/available");
        char availableTopic[topic.length() + 1];
        topic.toCharArray(availableTopic, topic.length() + 1);
        Serial.print("Availability topic: ");
        Serial.println(availableTopic);

        Serial.print("Connecting to MQTT ");
        Serial.print(mqttHost);
        Serial.print("...");

        if (client.connect(HOSTNAME, mqttUsername, mqttPassword, availableTopic, 1, true, "offline"))
        {
            Serial.println("connected");

Serial.printf("deleteTopic... %s\n", deleteTopic);
Serial.printf("learnTopic... %s\n", learnTopic);
Serial.printf("availableTopic... %s\n", availableTopic);

            client.publish(availableTopic, "online");
            client.subscribe(learnTopic);
            client.subscribe(deleteTopic);

            led(LED_READY);
        }
        else
        {
            Serial.print("failed, rc: ");
            Serial.print(client.state());
            Serial.println(" waiting for retry.");
        }
    }
}

Output from serial console:

00:04:19.606 -> No need to save config
00:04:19.711 -> Message: Waiting...
00:04:19.711 -> {"message":"Waiting...","state":"wait","mode":"reading","match":false,"fingerprintId":0,"userId":0,"confidence":0,"gate":"espfingscan1"}
00:04:19.849 -> Delete topic: /fingerprint/espfingscan1/delete
00:04:19.919 -> Test... deleteTopic /fingerprint/espfingscan1/delete
00:04:19.989 -> Test... deleteTopic /fingerprint/espfingscan1/delete
00:04:20.024 -> Test... deleteTopic /fingerprint/espfingscan1/delete/fingerprint/espfingscan1/learn
00:04:20.125 -> Learn topic: /fingerprint/espfingscan1/learn
00:04:20.160 -> Availability topic: /fingerprint/espfingscan1/available
00:04:20.229 -> Connecting to MQTT 192.168.1.1...connected
00:04:20.297 -> deleteTopic... /fingerprint/espfingscan1/delete/fingerprint/espfingscan1/learn
00:04:20.366 -> learnTopic... /fingerprint/espfingscan1/learn
00:04:20.401 -> availableTopic... /fingerprint/espfingscan1/available

That results with registering wrong "delete" topic ("deleteTopic = /fingerprint/espfingscan1/delete/fingerprint/espfingscan1/learn") on MQTT and propper topic "/fingerprint/espfingscan1/delete" just won't work.

[vinz486]

Thank you. I will check (in my spare time).

[bad-gargoyle]

Great project, by the way. That is what my OpenHAB system was missing. ;-) Thanks!

And by the way... For now, when that issue still persist, if someone still want to make "delete" topic work, you should use as "delete" topic this whole fraze ("/fingerprint/espfingscan1/delete/fingerprint/espfingscan1/learn"), and that's it. ;-)