[Bluetooth] - How to Host a RFCOMM Service in C++
Bluetooth is an industry-standard protocol that enables wireless connectivity for computers, handheld devices, mobile phones, and other devices.
RFCOMM emulates RS-232 (ITU-T V.24) serial ports. The emulation includes transfer of the state of the non-data circuits. RFCOMM has a built-in scheme for null modem emulation.
This blog will introduce how to use Windows Sockets functions to host a Bluetooth RFCOMM service, and use the Windows Runtime API to consume this service.
Steps:
#1 ask for Windows Sockets API (WSA) 2.2
The socket initialization only be required once for one process, so I put the initialization code in a static function.
#2 create a Windows socket
#3 create a Bluetooth address and bind to Windows socket
#4 register a Bluetooth service (SDP)
#5 listen to the Windows socket
# CODE #
RFCOMM Server (C++):
#include "stdafx.h"
#include "Winsock.h"
#include <WinSock2.h>
#include <ws2bth.h>
#include <bthsdpdef.h>
#include <bluetoothapis.h>
#pragma comment(lib, "ws2_32.lib")
#pragma comment(lib, "irprops.lib")
int main()
{
if (!Winsock::InitialzedForCurrentProcess())
{
return 1;
}
Winsock winsock = Winsock(AF_BTH, SOCK_STREAM, BTHPROTO_RFCOMM);
if (!winsock.IsValid())
{
return 1;
}
winsock.Bind();
winsock.Listen();
winsock.RegisterServcie(_T("RFCOMM Server Demo Instance"), _T("Pushing data to PC"), OBEXObjectPushServiceClass_UUID);
winsock.OnConnected([](SOCKET s){
char buffer[1024] = { 0 };
memset(buffer, 0, sizeof(buffer));
int r = 0;
do
{
r = recv(s, (char*)buffer, sizeof(buffer), 0);
printf("result:%d, %s\n", r, buffer);
} while (r != 0);
closesocket(s);
});
winsock.Accept();
WSACleanup();
return 0;
}
Code on Github: https://github.com/dream-365/winapp/tree/master/BluetoothPlay