2 files changed, 9 insertions, 0 deletions

diff --git a/minadbd/minadbd_services.cpp b/minadbd/minadbd_services.cpp
index 1e6eb3165..0becfa43c 100644
--- a/minadbd/minadbd_services.cpp
+++ b/minadbd/minadbd_services.cpp
@@ -190,6 +190,14 @@ static void RescueGetpropHostService(unique_fd sfd, const std::string& prop) {
   if (!android::base::WriteFully(sfd, result.data(), result.size())) {
     exit(kMinadbdHostSocketIOError);
   }
+
+  // Send heartbeat signal to keep the rescue service alive.
+  if (!WriteCommandToFd(MinadbdCommand::kNoOp, minadbd_socket)) {
+    exit(kMinadbdSocketIOError);
+  }
+  if (MinadbdCommandStatus status; !WaitForCommandStatus(minadbd_socket, &status)) {
+    exit(kMinadbdMessageFormatError);
+  }
 }
 
 // Reboots into the given target. We don't reboot directly from minadbd, but going through recovery
diff --git a/minadbd/minadbd_types.h b/minadbd/minadbd_types.h
index 99fd45e83..002523f1f 100644
--- a/minadbd/minadbd_types.h
+++ b/minadbd/minadbd_types.h
@@ -53,6 +53,7 @@ enum class MinadbdCommand : uint32_t {
   kRebootRescue = 6,
   kWipeCache = 7,
   kWipeData = 8,
+  kNoOp = 9,
 
   // Last but invalid command.
   kError,