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diff --git a/FreeRTOS-Labs/Source/FreeRTOS-Plus-TCP/include/FreeRTOS_DHCP.h b/FreeRTOS-Labs/Source/FreeRTOS-Plus-TCP/include/FreeRTOS_DHCP.h
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+++ b/FreeRTOS-Labs/Source/FreeRTOS-Plus-TCP/include/FreeRTOS_DHCP.h
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+/*
+ * FreeRTOS+TCP 191100 experimental
+ * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+#ifndef FREERTOS_DHCP_H
+#define FREERTOS_DHCP_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Application level configuration options. */
+#include "FreeRTOSIPConfig.h"
+#include "IPTraceMacroDefaults.h"
+
+/* Used in the DHCP callback if ipconfigUSE_DHCP_HOOK is set to 1. */
+typedef enum eDHCP_PHASE
+{
+	eDHCPPhasePreDiscover,	/* Driver is about to send a DHCP discovery. */
+	eDHCPPhasePreRequest,	/* Driver is about to request DHCP an IP address. */
+#if( ipconfigDHCP_SEND_DISCOVER_AFTER_AUTO_IP != 0 )
+	eDHCPPhasePreLLA,		/* Driver is about to try get an LLA address */
+#endif /* ipconfigDHCP_SEND_DISCOVER_AFTER_AUTO_IP */
+} eDHCPCallbackPhase_t;
+
+/* Used in the DHCP callback if ipconfigUSE_DHCP_HOOK is set to 1. */
+typedef enum eDHCP_ANSWERS
+{
+	eDHCPContinue,			/* Continue the DHCP process */
+	eDHCPUseDefaults,		/* Stop DHCP and use the static defaults. */
+	eDHCPStopNoChanges,		/* Stop DHCP and continue with current settings. */
+} eDHCPCallbackAnswer_t;
+
+/*
+ * NOT A PUBLIC API FUNCTION.
+ */
+void vDHCPProcess( BaseType_t xReset );
+
+/* Internal call: returns true if socket is the current DHCP socket */
+BaseType_t xIsDHCPSocket( Socket_t xSocket );
+
+/* Prototype of the hook (or callback) function that must be provided by the
+application if ipconfigUSE_DHCP_HOOK is set to 1.  See the following URL for
+usage information:
+http://www.FreeRTOS.org/FreeRTOS-Plus/FreeRTOS_Plus_TCP/TCP_IP_Configuration.html#ipconfigUSE_DHCP_HOOK
+*/
+eDHCPCallbackAnswer_t xApplicationDHCPHook( eDHCPCallbackPhase_t eDHCPPhase, uint32_t ulIPAddress );
+
+#ifdef __cplusplus
+}	/* extern "C" */
+#endif
+
+#endif /* FREERTOS_DHCP_H */
+
+
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