Rusty Nail
Reputation: 2710
C++ WinSock Bluetooth Connection - AT Command - Error Received
This is a continuation of this Question: https://stackoverflow.com/questions/37020491/programming-for-bluetooth-in-winsock-a-solution-needed
I am not strong in C++!
The Lib/Header files can be found here C:\Program Files (x86)\Windows Kits\8.1\Include\um which is part of the Windows SDK Kit here: Windows Software Development Kit (SDK) for Windows 8.1 or here Windows Software Development Kit (SDK) for Windows 10
My Code:
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
// MSDN Bluetooth and read or write operations:
// See: https://msdn.microsoft.com/en-us/library/windows/desktop/aa362907(v=vs.85).aspx
//
// MSDN Bluetooth and Connect
// See: https://msdn.microsoft.com/en-us/library/windows/desktop/aa362901(v=vs.85).aspx
//
// MSDN Send Function
// See: https://msdn.microsoft.com/en-us/library/windows/desktop/ms740149(v=vs.85).aspx
//
// Error Codes:
// See: https://msdn.microsoft.com/en-us/library/windows/desktop/ms740668(v=vs.85).aspx
//
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Includes:
#include <stdlib.h>
#include <stdio.h>
#include <iostream>
#include <WinSock2.h>
#include <bthsdpdef.h>
#include <bluetoothapis.h>
#include <ws2bth.h>
// Preprocessor Directive: Pragma's:
// Need to link with Ws2_32.lib
#pragma comment(lib, "ws2_32.lib")
// define Directive's:
#define DEFAULT_BUFLEN 512
DEFINE_GUID(GUID_NULL, "00000000-0000-0000-0000-000000000000");
int __cdecl main(int argc, char **argv)
{
std::cout << "******************************************************\r\n";
//--------------------------------------------
// Locals:
//--------------------------------------------
int result = 0;
ULONG iResult = 0;
LPTSTR RemoteEndPointMACAddr = (LPTSTR)"38:2D:E8:B9:FA:EB";
//--------------------------------------------
// Prep the Buffer's:
//--------------------------------------------
int recvbuflen = DEFAULT_BUFLEN;
char recvbuf[DEFAULT_BUFLEN] = "";
char *sendbuf = "AT+COPS?\r";
//--------------------------------------------
// Initialise WinSock.
//--------------------------------------------
WSADATA WSAData = { 0 };
WORD wVersionRequested = MAKEWORD(2, 2);
if ((iResult = WSAStartup(wVersionRequested, &WSAData)) != 0)
{
}
std::cout << "WINSOCK: 'WSAData' Return Code: " << WSAGetLastError() << "\r\n";
//--------------------------------------------
// The WinSock Socket.
//--------------------------------------------
SOCKET LocalSocket = INVALID_SOCKET;
//--------------------------------------------
// Local End Point SOCKADDR_BTH.
//--------------------------------------------
SOCKADDR_BTH LocalEndpoint;
// number of service channel, 0 or BT_PORT_ANY;
LocalEndpoint.port = 0;
LocalEndpoint.addressFamily = AF_BTH;
LocalEndpoint.btAddr = 0;
LocalEndpoint.serviceClassId = GUID_NULL;
std::cout << " Local EndPoint Address: " << LocalEndpoint.btAddr << "\r\n";
//--------------------------------------------
// Remote End Point SOCKADDR_BTH.
//--------------------------------------------
SOCKADDR_BTH RemoteEndPoint;
// number of service channel, 0 or BT_PORT_ANY;
RemoteEndPoint.port = 0;
RemoteEndPoint.addressFamily = AF_BTH;
RemoteEndPoint.btAddr = BTH_ADDR(0x382DE8B9FAEB);
RemoteEndPoint.serviceClassId = RFCOMM_PROTOCOL_UUID;
int BTHAddrLength = sizeof(RemoteEndPoint);
std::cout << " Remote EndPoint Address: " << RemoteEndPoint.btAddr << "\r\n";
//--------------------------------------------
// Create the socket.
//--------------------------------------------
if ((LocalSocket = socket(AF_BTH, SOCK_STREAM, BTHPROTO_RFCOMM)) == INVALID_SOCKET)
{
}
std::cout << "WINSOCK: 'socket' Return Code: " << WSAGetLastError() << "\r\n";
//--------------------------------------------
// Bind the socket.
//--------------------------------------------
if ((iResult = bind(LocalSocket, (SOCKADDR *)&LocalEndpoint, sizeof(LocalEndpoint))) == SOCKET_ERROR)
{
}
std::cout << "WINSOCK: 'bind' Return Code: " << WSAGetLastError() << "\r\n";
//--------------------------------------------
// Connect the socket.
//--------------------------------------------
if ((iResult = connect(LocalSocket, (SOCKADDR *)&RemoteEndPoint, sizeof(RemoteEndPoint))) == INVALID_SOCKET)
{
}
std::cout << "WINSOCK: 'connect' Return Code: " << WSAGetLastError() << "\r\n";
//--------------------------------------------
// Send the Buffer.
//--------------------------------------------
if ((iResult = send(LocalSocket, sendbuf, (int)strlen(sendbuf), 0)) == SOCKET_ERROR)
{
}
std::cout << "WINSOCK: 'send' Return Code: " << WSAGetLastError() << "\r\n";
std::cout << " Bytes Sent: " << sendbuf << "\r\n";
//--------------------------------------------
// Receive until the peer termination.
//--------------------------------------------
if ((iResult = recv(LocalSocket, recvbuf, recvbuflen, 0)) >= 1)
{
}
std::cout << "WINSOCK: 'recv' Return Code: " << WSAGetLastError() << "\r\n";
std::cout << " Data Received: " << recvbuf << "\r\n";
//--------------------------------------------
// Shutdown the connection.
//--------------------------------------------
if ((iResult = shutdown(LocalSocket, SD_SEND)) == SOCKET_ERROR)
{
}
std::cout << "WINSOCK: 'shutdown' Return Code: " << WSAGetLastError() << "\r\n";
//--------------------------------------------
// Close the Socket.
//--------------------------------------------
if ((iResult = closesocket(LocalSocket)) == SOCKET_ERROR)
{
}
std::cout << "WINSOCK: 'closesocket' Return Code: " << WSAGetLastError() << "\r\n";
WSACleanup();
std::cout << "END: " << "Application has completed!" << "\r\n";
std::getchar();
return 0;
}
Is someone able to tell me where I am going wrong, I am trying to send and receive AT Commands to the Bluetooth GSM Device. It’s a Samsung Ace.
I keep getting 'ERROR' returned. The command returns "OK" ..., and "ERROR" otherwise - However all AT Commands Fail with 'ERROR'
I have tried several UUID GUID's.
My Output is like so:
******************************************************
WINSOCK: 'WSAData' Return Code: 0
Local EndPoint Address: 0
Remote EndPoint Address: 61769829186283
WINSOCK: 'socket' Return Code: 0
WINSOCK: 'bind' Return Code: 0
WINSOCK: 'connect' Return Code: 0
WINSOCK: 'send' Return Code: 0
Bytes Sent: AT+COPS?
WINSOCK: 'recv' Return Code: 0
Data Received:
ERROR
WINSOCK: 'shutdown' Return Code: 0
WINSOCK: 'closesocket' Return Code: 0
END: Application has completed!
At the very least, I hope my questions help others.
Upvotes: 2
Views: 1818
Answers (1)
Rusty Nail
Reputation: 2710
Got it working!
For others out there, and there are many from my research, I hope this helps: If it has, please vote up!
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
// MSDN Bluetooth and Connect
// See: https://msdn.microsoft.com/en-us/library/windows/desktop/aa362901(v=vs.85).aspx
//
// MSDN Send Function
// See: https://msdn.microsoft.com/en-us/library/windows/desktop/ms740149(v=vs.85).aspx
//
// MSDN Bluetooth and read or write operations:
// See: https://msdn.microsoft.com/en-us/library/windows/desktop/aa362907(v=vs.85).aspx
//
// Error Codes:
// See: https://msdn.microsoft.com/en-us/library/windows/desktop/ms740668(v=vs.85).aspx
//
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Includes:
#include <stdlib.h>
#include <stdio.h>
#include <iostream>
#include <WinSock2.h>
#include <bthsdpdef.h>
#include <bluetoothapis.h>
#include <ws2bth.h>
// Preprocessor Directive: Pragma's:
// Need to link with Ws2_32.lib
#pragma comment(lib, "ws2_32.lib")
// define Directive's:
#define DEFAULT_BUFLEN 512
DEFINE_GUID(GUID_NULL, "00000000-0000-0000-0000-000000000000");
int __cdecl main(int argc, char **argv)
{
std::cout << "******************************************************\r\n";
//--------------------------------------------
// Locals:
//--------------------------------------------
int result = 0;
ULONG iResult = 0;
LPTSTR RemoteEndPointMACAddress = (LPTSTR)"38:2D:E8:B9:FA:EB";
//--------------------------------------------
// Prep the Buffer's:
//--------------------------------------------
int recvbuflen = DEFAULT_BUFLEN;
char recvbuf[DEFAULT_BUFLEN] = "";
char *sendbuf = "AT+COPS?\r";
int len = (int)strlen(sendbuf);
//--------------------------------------------
// Initialise WinSock.
//--------------------------------------------
WSADATA WSAData = { 0 };
WORD wVersionRequested = MAKEWORD(2, 2);
if ((iResult = WSAStartup(wVersionRequested, &WSAData)) != 0)
{
}
std::cout << "WINSOCK: 'WSAData' Return Code: " << WSAGetLastError() << "\r\n";
//--------------------------------------------
// The WinSock Socket.
//--------------------------------------------
SOCKET LocalSocket = INVALID_SOCKET;
//--------------------------------------------
// Local End Point SOCKADDR_BTH.
//--------------------------------------------
SOCKADDR_BTH LocalEndpoint;
// number of service channel, 0 or BT_PORT_ANY;
LocalEndpoint.port = 0;
LocalEndpoint.addressFamily = AF_BTH;
LocalEndpoint.btAddr = 0;
LocalEndpoint.serviceClassId = GUID_NULL;
std::cout << " Local EndPoint Address: " << LocalEndpoint.btAddr << "\r\n";
//--------------------------------------------
// Remote End Point SOCKADDR_BTH.
//--------------------------------------------
SOCKADDR_BTH RemoteEndPoint;
// number of service channel, 0 or BT_PORT_ANY;
RemoteEndPoint.port = 0;
RemoteEndPoint.addressFamily = AF_BTH;
RemoteEndPoint.btAddr = BTH_ADDR(0x382DE8B9FAEB);
RemoteEndPoint.serviceClassId = HandsfreeServiceClass_UUID; // RFCOMM_PROTOCOL_UUID
int BTHAddrLength = sizeof(RemoteEndPoint);
std::cout << " Remote EndPoint Address: " << RemoteEndPoint.btAddr << "\r\n";
//--------------------------------------------
// Create the socket.
//--------------------------------------------
if ((LocalSocket = socket(AF_BTH, SOCK_STREAM, BTHPROTO_RFCOMM)) == INVALID_SOCKET)
{
}
std::cout << "WINSOCK: 'socket' Return Code: " << WSAGetLastError() << "\r\n";
//--------------------------------------------
// Bind the socket.
//--------------------------------------------
if ((iResult = bind(LocalSocket, (SOCKADDR *)&LocalEndpoint, sizeof(LocalEndpoint))) == SOCKET_ERROR)
{
}
std::cout << "WINSOCK: 'bind' Return Code: " << WSAGetLastError() << "\r\n";
//--------------------------------------------
// Connect the socket.
//--------------------------------------------
if ((iResult = connect(LocalSocket, (SOCKADDR *)&RemoteEndPoint, sizeof(RemoteEndPoint))) == INVALID_SOCKET)
{
}
std::cout << "WINSOCK: 'connect' Return Code: " << WSAGetLastError() << "\r\n";
//--------------------------------------------
// Send the Buffer.
//--------------------------------------------
if ((iResult = send(LocalSocket, sendbuf, len, MSG_OOB)) == SOCKET_ERROR)
{
}
std::cout << "WINSOCK: 'send' Return Code: " << WSAGetLastError() << "\r\n";
std::cout << " Bytes Sent: " << sendbuf << "\r\n";
//--------------------------------------------
// Receive until the peer termination.
//--------------------------------------------
if ((iResult = recv(LocalSocket, recvbuf, recvbuflen, 0)) == SOCKET_ERROR)
{
}
std::cout << "WINSOCK: 'recv' Return Code: " << WSAGetLastError() << "\r\n";
std::cout << " Data Received: " << recvbuf << "\r\n";
//--------------------------------------------
// Shutdown the connection.
//--------------------------------------------
if ((iResult = shutdown(LocalSocket, SD_SEND)) == SOCKET_ERROR)
{
}
std::cout << "WINSOCK: 'shutdown' Return Code: " << WSAGetLastError() << "\r\n";
//--------------------------------------------
// Close the Socket.
//--------------------------------------------
if ((iResult = closesocket(LocalSocket)) == SOCKET_ERROR)
{
}
std::cout << "WINSOCK: 'closesocket' Return Code: " << WSAGetLastError() << "\r\n";
WSACleanup();
std::cout << "END: " << "Application has completed!" << "\r\n";
std::getchar();
return 0;
}
I had to use the 'HandsfreeServiceClass_UUID' UUID as you can see. I also set the Stream Type to 'MSG_OOB' in the send Method.
My Output:
******************************************************
WINSOCK: 'WSAData' Return Code: 0
Local EndPoint Address: 0
Remote EndPoint Address: 61769829186283
WINSOCK: 'socket' Return Code: 0
WINSOCK: 'bind' Return Code: 0
WINSOCK: 'connect' Return Code: 0
WINSOCK: 'send' Return Code: 0
Bytes Sent: AT+COPS?
WINSOCK: 'recv' Return Code: 0
Data Received:
+COPS: 0,0,"My Provider"
WINSOCK: 'shutdown' Return Code: 0
WINSOCK: 'closesocket' Return Code: 0
END: Application has completed!
EDIT If you want to send SMS Messages, a Server Socket will be needed on the GSM Device: Xamarin Android Connecting with bluetooth device or: Android Bluetooth COM port or SENA BTerm Bluetooth Terminal
Upvotes: 2
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