commit 362e1673c2b2d8c4433e6a4858133434656eb744
author Allen Webb <allenwebb@google.com> Thu Dec 14 16:14:13 2017 -0800
committer Allen Webb <allenwebb@google.com> Thu Dec 14 16:14:13 2017 -0800
tree 1e6c153516fa37e1d034cded99018e973cca0423
parent 5eba38c1cb834e83099c22a52646671f602f6cda

Retry status datagram to handle sleep / reboot.

Change-Id: If4959b2ca940fe4c6d1eb2202480afbddc033c7f

libnos_transport/transport.c

diff --git a/libnos_transport/transport.c b/libnos_transport/transport.c
index 6ce8ef7..1e981ed 100644
--- a/libnos_transport/transport.c
+++ b/libnos_transport/transport.c
@@ -20,6 +20,7 @@
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 
 #include <application.h>
 
@@ -59,7 +60,7 @@
   uint32_t command = CMD_ID(app_id) | CMD_IS_READ | CMD_TRANSPORT;
 
   if (0 != dev->ops.read(dev->ctx, command, buf, sizeof(buf))) {
-    NLOGE("Failed to read device status");
+    NLOGV("Failed to read device status");
     return -1;
   }
 
@@ -91,9 +92,18 @@
   uint32_t status;
   uint16_t ulen;
   uint32_t poll_count = 0;
+  uint16_t retries = 10;
 
   /* Make sure it's idle */
-  if (get_status(dev, app_id, &status, &ulen) != 0) {
+  while (retries) {
+    if (get_status(dev, app_id, &status, &ulen) == 0) {
+      break;
+    }
+    --retries;
+    usleep(5000);
+  }
+  if (!retries) {
+    NLOGE("Failed to read device status");
     return APP_ERROR_IO;
   }
   NLOGV("%d: query status 0x%08x  ulen 0x%04x", __LINE__, status, ulen);