[問題] 想請問藍芽socket傳輸資料被截掉的問題

看板C_and_CPP (C/C++)作者kiwi90310 (kiwi90310)時間11年前 (2015/03/24 16:51)推噓1(1推 0噓 3→)

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開發平台(Platform): (Ex: VC++, GCC, Linux, ...) 樹莓派(Linux,但程式用C寫) 問題(Question)：新手小弟用BTdongle藍芽連接HC-05接收感測器傳來的值但收到的值都被裁掉了想請問各位大大該如何修改程式碼讓他不被裁掉? 之前發過很像的問題這次想從另一方向著手但解決的函數沒有開放原始碼所以不知該怎設變數去做修改與運算 (想用完整的字串atof轉浮點樹去做運算) 在此先感謝各位大大!! 餵入的資料(Input)：藍芽傳來的字串資料預期的正確結果(Expected Output)： 0~255的值錯誤結果(Wrong Output)：字串被裁掉，如下網址 http://ppt.cc/ZmYT 程式碼(Code)：(請善用置底文網頁, 記得排版) #include <stdio.h> #include <errno.h> #include <stdlib.h> #include <unistd.h> #include <bluetooth/bluetooth.h> #include <bluetooth/sdp.h> #include <bluetooth/sdp_lib.h> #include <sys/socket.h> #include <bluetooth/rfcomm.h> //-- 搜尋遠端 SPP Server 所使用的 RFCOMM Port Number // 回傳 RFCOMM Port Number int main(int argc, char **argv) { struct sockaddr_rc addr = { 0 }; int status, len, rfcommsock; char rfcommbuffer[255]; char dest[18] = "10:14:07:10:29:52"; // 藍牙 SPP Server 的位址 // allocate a socket rfcommsock = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM); // set the connection parameters (who to connect to) addr.rc_family = AF_BLUETOOTH; // 先找到 SPP Server 可被連接的 Port Number ( or channel number ) addr.rc_channel = 1; str2ba( dest, &addr.rc_bdaddr ); // 等幾秒鐘之後再連接到 SPP Server sleep(5); // 連接 SPP Server status = connect(rfcommsock, (struct sockaddr *)&addr, sizeof(addr)); //------------------------------------------------------------------------------ // send/receive messages if( status == 0 ) { // say hello to client side status = send(rfcommsock, "hello!", 6, 0); if( status < 0 ) { perror( "rfcomm send " ); close(rfcommsock); return -1; } while(1) { // 從 RFCOMM socket 讀取資料 // 這個 socket // this socket has blocking turned off so it will never block, // even if no data is available len = recv(rfcommsock, rfcommbuffer, 255, 0); // EWOULDBLOCK indicates the socket would block if we had a // blocking socket. we'll safely continue if we receive that // error. treat all other errors as fatal if (len < 0 && errno != EWOULDBLOCK) { perror("rfcomm recv "); break; } else if (len > 0) { // received a message; print it to the screen and // return ATOK to the remote device rfcommbuffer[len] = '\0'; printf("rfcomm received data: %s\n",rfcommbuffer); status = send(rfcommsock, "ATOK\r\n", 6, 0); if( status < 0 ) { perror("rfcomm send "); break; } } } } else if( status < 0 ) { perror("uh oh"); } close(rfcommsock); return 0; } -- ※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 140.125.20.81 ※ 文章網址: https://www.ptt.cc/bbs/C_and_CPP/M.1427187108.A.A10.html