--- /dev/null
+
+l2cap_client
+
+Is a small test application to test the Bluetooth connection to
+Oswald-MetaWatch. It opens a L2CAP connection to a give Bluetooth address.
+After successful connection establishment it output all data received to
+stdout and send data received from stdin (keyboard) to the watch. Input via
+stdin is not in cbreak mode, i.e. input must be finished with CR before it
+is sent to the watch.
+
+Building
+Simply type "make". Depend on libbluetooth and its development files.
+
+Running
+Start with Bluetooth address of the watch as cmdline argument:
+ l2cap_client 11:22:33:44:55:66
--- /dev/null
+/*
+ * (c) 2013 Nils Faerber, Siegen, Germany
+ * licensed under GPLv2
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/select.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <fcntl.h>
+#include <bluetooth/bluetooth.h>
+#include <bluetooth/l2cap.h>
+
+int main(int argc, char **argv)
+{
+ struct sockaddr_l2 addr = { 0 };
+ int s, status, len, i;
+ char buf[255];
+ char dest[18];
+ fd_set infds;
+ fd_set efds;
+
+ if (argc < 2) {
+ fprintf(stderr, "usage: %s <bt_addr>\n", argv[0]);
+ exit(2);
+ }
+
+ strncpy(dest, argv[1], 18);
+
+ // allocate a socket
+ s = socket(AF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP);
+
+ // set the connection parameters (who to connect to)
+ addr.l2_family = AF_BLUETOOTH;
+ addr.l2_psm = htobs(0x1001);
+ str2ba( dest, &addr.l2_bdaddr );
+
+ // connect to server
+ status = connect(s, (struct sockaddr *)&addr, sizeof(addr));
+
+ // send a message
+ if ( status != 0 ) {
+ perror("open socket");
+ close(s);
+ return -1;
+ }
+
+ fprintf(stderr, "connected\n");
+
+ if (fcntl(0, F_SETFL, O_NONBLOCK) != 0)
+ perror("stdin nonblock");
+ if (fcntl(s, F_SETFL, O_NONBLOCK) != 0)
+ perror("socket nonblock");
+
+ while (1) {
+ FD_ZERO(&infds);
+ FD_SET(s, &infds);
+ FD_SET(0, &infds);
+ FD_ZERO(&efds);
+ FD_SET(s, &efds);
+ status = select(s+1, &infds, NULL, &efds, NULL);
+ // fprintf(stderr, "select = %d\n", status);
+ if ( status > 0) {
+ if (FD_ISSET(0, &infds)) {
+ len = read(0, buf, 240);
+ if (len > 0) {
+ status = write(s, buf, len);
+ if (status < 0)
+ perror("write");
+ fsync(s);
+ }
+ } else if (FD_ISSET(s, &infds)) {
+ len = read(s, buf, 240);
+ // fprintf(stderr, "read = %d\n", len);
+ for (i=0; i<len; i++)
+ fprintf(stderr, "%c", buf[i]);
+ // fprintf(stderr, "\n");
+ } else if (FD_ISSET(s, &efds)) {
+ fprintf(stderr, "e on socket\n");
+ } else
+ fprintf(stderr, "hu?");
+ } else
+ perror("select");
+ };
+
+
+ close(s);
+
+ return 0;
+}
+