Trouble setting up Argon web server

Firmware
1

I’ve set up a simple web server on an Argon that will send the value of a variable as a JSON string back to the client. I can access this through cURL, but any other means (such as through a browser or python requests/pycurl libs) return an error saying the connection was closed by the peer.

Here is my Particle code:

WiFiSignal sig;
int strength;

TCPClient webClient;
TCPServer webServer = TCPServer(80);
char myIpAddress[24];

void setup() {
    //IPAddress myIp = Network.localIP();
    webServer.begin();
    Serial.begin();
    pinMode(D2, INPUT);
    pinMode(D3, OUTPUT);
    digitalWrite(D3, LOW);
    Particle.variable("measure", &strength, INT);
}

void loop() {
    strength = measureStrength();
    
    if (webClient.connected() && webClient.available()) {
        digitalWrite(D3, HIGH);
        webClient.print("{\"result\": ");
        webClient.print(strength);
        webClient.println("}");
        webClient.flush();
        delay(1000);
        webClient.stop();
        delay(100);
    }
    else {
        webClient = webServer.available();
    }
}

int measureStrength(){
    //digitalWrite(D3, HIGH);
    delay(200);
    sig = WiFi.RSSI();
    strength = sig.getQualityValue();
    delay(200);
    //digitalWrite(D3, LOW);
    return strength;
}

When I run curl 192.168.1.18, i get the response {“result”: n} as expected.

When I run the equivalent request in python i get the following error:
pycurl.error: (56, ‘Recv failure: Connection reset by peer’)

Any help would be much appreciated.

Thanks in advance.

2

This approach has been deprecated and should now be written like this:
Particle.variable("measure", strength);

Since strength is declared as a global int there is no need for measureStrength() to return an int.

3

The connection loop should look something like this instead:

TcpClient client = webClient.available();
if (client.connected()) {
        digitalWrite(D3, HIGH);
        cient.print("{\"result\": ");
        client.print(strength);
        client.println("}");
        client.flush();
        delay(1000);
        client.stop();
        delay(100);
    }

Basically, available() on the TCPServer object returns a TCPClient for a specific connection, allowing multiple (4) client connections. You do all of the communication with that client using the returned object instead of the TCPServer object.

4

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