only wake the device up when the timeout really expired

[hmcfgusb] / hmsniff.c

diff --git a/hmsniff.c b/hmsniff.c
index e8424533009813c0f47fc8d0cd3ee4020a6c96a5..ee148006a87a3add07d80ca3c3ba2168da583022 100644 (file)
--- a/hmsniff.c
+++ b/hmsniff.c
@@ -188,6 +188,7 @@ int main(int argc, char **argv)
                }
                printf("HM-CFG-USB opened!\n");
 
+               hmcfgusb_send_null_frame(dev, 1);
                hmcfgusb_send(dev, (unsigned char*)"K", 1, 1);
 
                while(!quit) {
@@ -199,14 +200,19 @@ int main(int argc, char **argv)
                                rdata.wrong_hmid = 0;
                                hmcfgusb_send(dev, (unsigned char*)"K", 1, 1);
                        }
-                       fd = hmcfgusb_poll(dev, 10);
+                       fd = hmcfgusb_poll(dev, 1);
                        if (fd >= 0) {
                                fprintf(stderr, "activity on unknown fd %d!\n", fd);
                                continue;
                        } else if (fd == -1) {
                                if (errno) {
-                                       perror("hmcfgusb_poll");
-                                       break;
+                                       if (errno != ETIMEDOUT) {
+                                               perror("hmcfgusb_poll");
+                                               break;
+                                       } else {
+                                               /* periodically wakeup the device */
+                                               hmcfgusb_send_null_frame(dev, 1);
+                                       }
                                }
                        }
                }