Call ASMX webserver from Arduino Ethernet

[paolo_fi]

Hi all,
I am trying to send data to my webserver written in c#.
By calling the service from the browser this works correctly.
The arduino is a Portenta H7 although I don't think it makes much difference.
The code is a collage of articles found on the net.

#include <PortentaEthernet.h>
#include <Ethernet.h>

char server[] = "localhost"; 

// Set the static IP address to use if the DHCP fails to assign
IPAddress ip(192, 168, 1, 177);
IPAddress myDns(192, 168, 1, 1);

EthernetClient client;

// Variables to measure the speed
unsigned long beginMicros, endMicros;
unsigned long byteCount = 0;
bool printWebData = true; // set to false for better speed measurement

void setup()
{
    Serial.begin(9600);
    while (!Serial) { ; }

    // start the Ethernet connection:
    Serial.println("Initialize Ethernet with DHCP:");
    if (Ethernet.begin() == 0) {
        Serial.println("Failed to configure Ethernet using DHCP");
        // Check for Ethernet hardware present
        if (Ethernet.hardwareStatus() == EthernetNoHardware) {
            Serial.println("Ethernet shield was not found.  Sorry, can't run without hardware. :(");
            while (true) {
                delay(1); // do nothing, no point running without Ethernet hardware
            }
        }
        if (Ethernet.linkStatus() == LinkOFF) {
            Serial.println("Ethernet cable is not connected.");
        }
        // try to congifure using IP address instead of DHCP:
        Ethernet.begin(ip, myDns);
    } else {
        Serial.print("  DHCP assigned IP ");
        Serial.println(Ethernet.localIP());
    }
    // give the Ethernet shield a second to initialize:
    delay(1000);
    Serial.print("connecting to ");
    Serial.print(server);
    Serial.println("...");

    // if you get a connection, report back via serial:
    if (client.connect(server, 8080)) {
        Serial.print("connected to ");
        Serial.println(client.remoteIP());
        // Make a HTTP request:

        //client.println("GET /webservice.asmx/query?id=Bot&nserial=1&qry=SELECT * FROM Data&ver=1&flg=0&par1=&par2=&par3= HTTP/1.0");
        client.println("GET /localhost/webservice.asmx/query?id=Bot&nserial=1&qry=SELECT * FROM Data&ver=1&flg=0&par1=&par2=&par3=HTTP/1.0");        
        client.println("Host: " + String(server));
        client.println("Connection: close");
        client.println();

        // //client.println("POST /webservice/webservice.asmx/query HTTP/1.0");
        // client.println("POST /webservice.asmx/query HTTP/1.0");
        // client.println("Host: " + String(server));
        // client.println("Content-Type: application/x-www-form-urlencoded");
        // client.println("Content-Length:69");
        // client.println("id=Bot&nserial=1&qry=SELECT * FROM Data&ver=1&flg=0&par1=&par2=&par3=");
        // client.println("Connection: close");
        // client.println();

        client.stop();

    } else {
        Serial.println("connection failed");
    }
    beginMicros = micros();
}

void loop()
{
    int len = client.available();
    if (len > 0) {
        byte buffer[80];
        if (len > 80)
            len = 80;
        client.read(buffer, len);
        if (printWebData) {
            Serial.write(buffer, len); // show in the serial monitor (slows some boards)
        }
        byteCount = byteCount + len;
    }

    if (!client.connected()) {
        endMicros = micros();
        Serial.println();
        Serial.println("disconnecting.");
        client.stop();
        Serial.print("Received ");
        Serial.print(byteCount);
        Serial.print(" bytes in ");
        float seconds = (float)(endMicros - beginMicros) / 1000000.0;
        Serial.print(seconds, 4);
        float rate = (float)byteCount / seconds / 1000.0;
        Serial.print(", rate = ");
        Serial.print(rate);
        Serial.print(" kbytes/second");
        Serial.println();

        // do nothing forevermore:
        while (true) {
            delay(1);
        }
    }
}

I have tried both GET and POST but cede I have problems with passing parameters I have tried various solutions but to no avail.
initially my asmx service was in a subdirectory I tried moving it to the root of the local server but nothing changes.
In most cases I get a 400 bad request error, or the client connects but returns no message.

Initialize Ethernet with DHCP:
DHCP assigned IP 192.168.1.154
connecting to 192.168.1.169...
connected to 192.168.1.169
disconnecting.
Received 0 bytes in 0.0000, rate = 0.00 kbytes/second

What is the correct syntax for connecting to the webserver by passing parameters?

Many thanks to those who would like to help me.

Lenny