diff --git a/command/open_session.hpp b/command/open_session.hpp
new file mode 100644
index 0000000..f5111d2
--- /dev/null
+++ b/command/open_session.hpp
@@ -0,0 +1,180 @@
+#pragma once
+
+#include <vector>
+
+#include "message_handler.hpp"
+
+namespace command
+{
+
+/*
+ * @ struct OpenSessionRequest
+ *
+ * IPMI Payload for RMCP+ Open Session Request
+ */
+struct OpenSessionRequest
+{
+    uint8_t messageTag;  // Message tag from request buffer
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+    uint8_t maxPrivLevel : 4 ;// Requested maximum privilege level
+    uint8_t reserved1 : 4;  // Reserved for future definition
+#endif
+
+#if BYTE_ORDER == BIG_ENDIAN
+    uint8_t reserved1 : 4;  // Reserved for future definition
+    uint8_t maxPrivLevel : 4 ;// Requested maximum privilege level
+
+#endif
+
+    uint16_t reserved2;
+    uint32_t remoteConsoleSessionID ;
+
+    uint8_t authPayload ;
+    uint16_t  reserved3;
+    uint8_t  authPayloadLen;
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+    uint8_t authAlgo : 6;
+    uint8_t reserved4 : 2;
+#endif
+
+#if BYTE_ORDER == BIG_ENDIAN
+    uint8_t reserved4 : 2;
+    uint8_t authAlgo : 6;
+#endif
+
+    uint8_t reserved5;
+    uint16_t reserved6;
+
+    uint8_t intPayload;
+    uint16_t reserved7;
+    uint8_t  intPayloadLen;
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+    uint8_t intAlgo : 6;
+    uint8_t reserved8 : 2;
+#endif
+
+#if BYTE_ORDER == BIG_ENDIAN
+    uint8_t reserved8 : 2;
+    uint8_t intAlgo : 6;
+#endif
+
+    uint8_t reserved9;
+    uint16_t reserved10;
+
+    uint8_t confPayload;
+    uint16_t reserved11;
+    uint8_t  confPayloadLen;
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+    uint8_t confAlgo : 6;
+    uint8_t reserved12 : 2;
+#endif
+
+#if BYTE_ORDER == BIG_ENDIAN
+    uint8_t reserved12 : 2;
+    uint8_t confAlgo : 6;
+#endif
+
+    uint8_t reserved13;
+    uint16_t reserved14;
+} __attribute__((packed));
+
+/*
+ * @ struct OpenSessionResponse
+ *
+ * IPMI Payload for RMCP+ Open Session Response
+ */
+struct OpenSessionResponse
+{
+    uint8_t messageTag;
+    uint8_t status_code;
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+    uint8_t maxPrivLevel : 4;
+    uint8_t reserved1 : 4;
+#endif
+
+#if BYTE_ORDER == BIG_ENDIAN
+    uint8_t reserved1 : 4;
+    uint8_t maxPrivLevel : 4;
+#endif
+
+    uint8_t reserved2;
+    uint32_t remoteConsoleSessionID;
+    uint32_t managedSystemSessionID;
+
+    uint8_t authPayload;
+    uint16_t reserved3;
+    uint8_t authPayloadLen;
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+    uint8_t authAlgo : 6;
+    uint8_t reserved4 : 2;
+#endif
+
+#if BYTE_ORDER == BIG_ENDIAN
+    uint8_t reserved4 : 2;
+    uint8_t authAlgo : 6;
+#endif
+
+    uint8_t reserved5;
+    uint16_t reserved6;
+
+    uint8_t intPayload;
+    uint16_t reserved7;
+    uint8_t  intPayloadLen;
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+    uint8_t intAlgo : 6;
+    uint8_t reserved8 : 2;
+#endif
+
+#if BYTE_ORDER == BIG_ENDIAN
+    uint8_t reserved8 : 2;
+    uint8_t intAlgo : 6;
+
+#endif
+
+    uint8_t reserved9;
+    uint16_t reserved10;
+
+    uint8_t confPayload;
+    uint16_t reserved11;
+    uint8_t  confPayloadLen;
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+    uint8_t confAlgo : 6;
+    uint8_t reserved12 : 2;
+#endif
+
+#if BYTE_ORDER == BIG_ENDIAN
+    uint8_t reserved12 : 2;
+    uint8_t confAlgo : 6;
+#endif
+
+    uint8_t reserved13;
+    uint16_t reserved14;
+} __attribute__((packed));
+
+/*
+ * @brief RMCP+ Open Session Request, RMCP+ Open Session Response
+ *
+ * The RMCP+ Open Session request and response messages are used to enable a
+ * remote console to discover what Cipher Suite(s) can be used for establishing
+ * a session at a requested maximum privilege level. These messages are also
+ * used for transferring the sessions IDs that the remote console and BMC wish
+ *  to for the session once it’s been activated, and to track each party during
+ *  the exchange of messages used for establishing the session.
+ *
+ * @param[in] inPayload - Request Data for the command
+ * @param[in] handler - Reference to the Message Handler
+ *
+ * @return Response data for the command
+ */
+std::vector<uint8_t> openSession(std::vector<uint8_t>& inPayload,
+                                 const message::Handler& handler);
+
+} // namespace command