diff --git a/tools/ipmi/updatehelper.cpp b/tools/ipmi/updatehelper.cpp
new file mode 100644
index 0000000..2be224a
--- /dev/null
+++ b/tools/ipmi/updatehelper.cpp
@@ -0,0 +1,72 @@
+/*
+ * Copyright 2018 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "config.h"
+
+#include "updatehelper.hpp"
+
+#include <cstring>
+#include <vector>
+
+namespace
+{
+// Output a vector of bytes consisted of the command header and given input.
+// Precondition: packet must be preallocated with kFlashCommandHdrSizeBytes.
+void constructFlashIpmiPacket(int command, const uint8_t* payload,
+                              int payload_size, std::vector<uint8_t>* packet)
+{
+    struct CommandHdr hdr;
+    std::memset(&hdr, 0, sizeof(hdr));
+
+    hdr.command = OEM_FLASH_UPDATE_BT_COMMAND;
+    hdr.subcommand = command;
+
+#ifdef ENABLE_GOOGLE
+    hdr.netfn = NETFN_OEM;
+    std::memcpy(&hdr.oen, OEN_GOOGLE, sizeof(OEN_GOOGLE));
+#else
+    hdr.netfn = NETFN_FIRMWARE;
+#endif
+
+    std::memcpy(packet->data(), &hdr, sizeof(hdr));
+
+    if (payload != nullptr && payload_size > 0)
+    {
+        packet->insert(packet->end(), payload, payload + payload_size);
+    }
+}
+} // namespace
+
+/*
+ * For use with BT Flash commands with payloads
+ */
+struct IpmiResponse
+    IpmiUpdateHelper::SendCommand(int command,
+                                  const std::vector<uint8_t>& payload)
+{
+    std::vector<uint8_t> packet(kFlashCommandHdrSizeBytes);
+    constructFlashIpmiPacket(command, payload.data(), payload.size(), &packet);
+
+    return raw->Raw(packet);
+}
+
+/*
+ * For use with BT Flash commands that are only the command itself.
+ */
+struct IpmiResponse IpmiUpdateHelper::SendEmptyCommand(int command)
+{
+    return SendCommand(command, {});
+}