I am working on a Bluetooth project involving one Arduino (with Seeed bluetooth shield v2.0) and one ubuntu laptop. Basically, I want message exchanges between the Arduino and the laptop. I paired the Arduino bluetooth shield with the laptop. Then I use the code below (on the laptop) to test. The Arduino is set as a Slave. And the laptop sends a test message.
#include <stdio.h>
#include <unistd.h>
#include <sys/socket.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/rfcomm.h>
int main(int argc, char **argv){
struct sockaddr_rc addr = {0};
int s, status;
char buf[1024] = {0};
char dest[18] = "00:0E:EA:CF:1E:62";
for (size_t i = 1; i <= 30; i++) {
addr.rc_channel = i;
str2ba(dest, &addr.rc_bdaddr);
// connect to server
s = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM);
status = connect(s, (struct sockaddr *)&addr, sizeof(addr));
if(status == 0) {
status = send(s, "Hello!", 6, 0);
status = recv(s, buf, sizeof(buf), 0);
if(status > 0)
printf("received %s\n", buf);
break;
}
}
if(status < 0)
perror("send error");
close(s);
return 0;
}
Below is the test code at Arduino side.
#include <SoftwareSerial.h> //Software Serial Port
#define RxD 7
#define TxD 6
SoftwareSerial bt(RxD,TxD);
char buf[100];
size_t idx;
void setup() {
Serial.begin(9600);
bt.begin(9600);
pinMode(RxD, INPUT);
pinMode(TxD, OUTPUT);
setupBlueToothConnection();
}
void loop() {
Serial.println("Waiting ...");
idx = 0;
memset(buf, sizeof(buf), 0);
while(bt.available()){
buf[idx] = bt.read();
idx++;
}
while(idx >= 0){
bt.write(buf[idx]);
idx--;
}
delay(1000);
}
void setupBlueToothConnection() {
bt.print("AT");
delay(400);
bt.print("AT+DEFAULT"); // Restore all setup value to factory setup
delay(2000);
bt.print("AT+LADD?"); // Restore all setup value to factory setup
delay(2000);
bt.print("AT+NAMEProver"); // set the bluetooth name as "SeeedBTSlave"
delay(400);
bt.print("AT+PIN0000"); // set the pair code to connect
delay(400);
bt.print("AT+ROLE?");
delay(400);
bt.print("AT+AUTH0");
delay(400);
bt.flush();
}
I receive error message: "send error: Connection refused". What is the problem? Can some help me with this? Thanks!
Update: I guess it might be the problem with port number. But I checked the datasheet for Seeed Bluetooth shield v2.0 and has not found any clue regarding to setup port number.
