cannot send data from pc to raspberry pi

[reddevil1310]

i am connect pc to raspberry pi to send a message. but it can't read any character?

this is program from pi:

#define _CRT_SECURE_NO_WARNINGS

#include <iostream>
#include <exception>
#include <vector>
#include <memory>
#include <ctime>
#include "DeviceINQ.h"
#include "Enums.h"
#include "BluetoothException.h"
#include "BTSerialPortBinding.h"
#include <QThread>

using namespace std;

string formatDate(const char *format, time_t time)
{
    if (time <= 0)
        return "--";

    char buffer[256] = { 0 };
    tm *timeinfo = localtime(&time);

    if (timeinfo)
        strftime(buffer, sizeof(buffer), format, timeinfo);

    return buffer;
}

int main()
{
    try
    {
        unique_ptr<DeviceINQ> inq(DeviceINQ::Create());
        vector<device> devices = inq->Inquire();

        for (const auto& d : devices)
        {
            cout << "\tname: " << d.name << endl;
            cout << "\taddress: " << d.address << endl;
            cout << "\tclass: " << GetDeviceClassString(d.deviceClass) << endl;
            cout << "\tmajor class: " << GetDeviceClassString(d.majorDeviceClass) << endl;
            cout << "\tservice class: " << GetServiceClassString(d.serviceClass) << endl;
            cout << "\tlast seen: " << formatDate("%c", d.lastSeen) << endl;
            cout << "\tlast used: " << formatDate("%c", d.lastUsed) << endl;
            cout << "\tchannel ID: " << inq->SdpSearch(d.address) << endl;
            cout << endl;
            if(d.name == "DESKTOP-B1U1RIH") {

                BTSerialPortBinding *bt = BTSerialPortBinding::Create(d.address, 1);
                bt->Connect();
                char readC[100];
                while(true) {

                    if(bt->IsDataAvailable()) {
                        std::cout<<"start read";
                        bt->Read(readC, 100);
                        std::cout<<"read: "<<readC<<std::endl;
                    }
                    else {
                        std::cout<<"IsDataAvailable not available"<<std::endl;;
                    }
                    QThread::sleep(1);
                }
            }
        }

        cout << endl << "done, found " << devices.size() << " device(s)" << endl;
    }
    catch (const BluetoothException& e)
    {
        cout << e.what() << endl;
    }

    return 0;
}

This is program in pc:

#define _CRT_SECURE_NO_WARNINGS

#include <iostream>
#include <exception>
#include <vector>
#include <memory>
#include <ctime>
#include "DeviceINQ.h"
#include "Enums.h"
#include "BluetoothException.h"
#include "BTSerialPortBinding.h"
#include <QThread>

using namespace std;

string formatDate(const char *format, time_t time)
{
    if (time <= 0)
        return "--";

    char buffer[256] = { 0 };
    tm *timeinfo = localtime(&time);

    if (timeinfo)
        strftime(buffer, sizeof(buffer), format, timeinfo);

    return buffer;
}

int main()
{
    try
    {
        unique_ptr<DeviceINQ> inq(DeviceINQ::Create());
        vector<device> devices = inq->Inquire();

        for (const auto& d : devices)
        {
            cout << "\tname: " << d.name << endl;
            cout << "\taddress: " << d.address << endl;
            cout << "\tclass: " << GetDeviceClassString(d.deviceClass) << endl;
            cout << "\tmajor class: " << GetDeviceClassString(d.majorDeviceClass) << endl;
            cout << "\tservice class: " << GetServiceClassString(d.serviceClass) << endl;
            cout << "\tlast seen: " << formatDate("%c", d.lastSeen) << endl;
            cout << "\tlast used: " << formatDate("%c", d.lastUsed) << endl;
            cout << "\tchannel ID: " << inq->SdpSearch(d.address) << endl;
            cout << endl;

            if(d.name == "raspberrypi") {
                BTSerialPortBinding *bt = BTSerialPortBinding::Create(d.address, 5);
                bt->Connect();
                while(true) {
                        std::string data = "test send serialport";
                        bt->Write(data.c_str(), data.length());
                        QThread::sleep(1);
                }
            }
        }

        cout << endl << "done, found " << devices.size() << " device(s)" << endl;



    }
    catch (const BluetoothException& e)
    {
        cout << e.what() << endl;
    }

    return 0;
}

Where did I go wrong? Anyone can help?
Thank you.

[Agamnentzar]

BTSerialPortBinding *bt = BTSerialPortBinding::Create(d.address, 5);

Did you try it with 1 instead of 5 ?

You can also try without if(bt->IsDataAvailable()) { and see if you get something in that case.

[reddevil1310]

BTSerialPortBinding *bt = BTSerialPortBinding::Create(d.address, 5);

Did you try it with 1 instead of 5 ?

You can also try without if(bt->IsDataAvailable()) { and see if you get something in that case.

@Agamnentzar I try with 1 but it's not working. I also try without if(bt->IsDataAvailable()), it's still failed.

[Agamnentzar]

Oh ok I see it now, you're connecting as a client on both sides, I don't think that will work. I think one side has to be a server that's listening for a connection. This library was created to connect to devices that already host COM port service so I'm not sure how to setup that up. I think you might need to write some custom code for that.

[reddevil1310]

@Agamnentzar How to create a server for connection? Thank you

[Agamnentzar]

I don't know, I never had to do that.

[reddevil1310]

Thank you @Agamnentzar