networking: lifecycle

Basic steps towards lifecycle handling, starting with  initialization

Signed-off-by: David Piskula <david.piskula@nxp.com>

Author: dpiskula-nxp

include/zephyr/net/mcp/mcp_server.h

@@ -13,12 +13,30 @@
 extern "C" {
 #endif
 
+struct mcp_message_msg {
+	uint32_t token;
+	/* More fields will be added later */
+};
+
 /**
  * @brief Initialize the MCP Server.
  *
  */
 int mcp_server_init(void);
 
+/**
+ * @brief Start the MCP Server.
+ *
+ */
+int mcp_server_start(void);
+
+/**
+ * @brief Queues a response to the MCP Server library, which takes care of sending it to
+ * the MCP Client.
+ *
+ */
+int mcp_queue_response(void);
+
 #ifdef __cplusplus
 }
 #endif

samples/net/mcp/mcp_server_hello_world/prj.conf

@@ -27,3 +27,4 @@ CONFIG_NET_CONFIG_MY_IPV4_ADDR="192.0.2.1"
 
 # Sufficient stack size for HTTP + JSON processing
 CONFIG_MAIN_STACK_SIZE=4096
+CONFIG_HEAP_MEM_POOL_SIZE=16384

samples/net/mcp/mcp_server_hello_world/src/main.c

@@ -13,6 +13,9 @@ LOG_MODULE_REGISTER(mcp_sample_hello, LOG_LEVEL_INF);
 int main(void)
 {
 	printk("Hello World\n\r");
+	printk("Initializing...\n\r");
 	mcp_server_init();
+	printk("Starting...\n\r");
+	mcp_server_start();
 	return 0;
 }

subsys/net/lib/mcp/CMakeLists.txt

@@ -3,6 +3,7 @@
 
 zephyr_library()
 
+zephyr_library_sources_ifdef(CONFIG_MCP_SERVER mcp_common.c)
 zephyr_library_sources_ifdef(CONFIG_MCP_SERVER mcp_server.c)
 zephyr_library_sources_ifdef(CONFIG_MCP_SERVER mcp_transport.c)
 zephyr_library_sources_ifdef(CONFIG_MCP_SERVER mcp_json.c)

subsys/net/lib/mcp/Kconfig

@@ -5,10 +5,159 @@ menuconfig MCP_SERVER
 	bool "Model Context Protocol (MCP) Server support"
 	depends on NETWORKING && HTTP_SERVER && JSON_LIBRARY
 	help
-	  Enable support for MCP Server functionality.
+	  Support for MCP Server functionality.
 
 if MCP_SERVER
 
+config HTTP_SERVER_MAX_CLIENTS
+	int "Max number of HTTP/2 clients"
+	default 3
+	range 1 100
+	help
+	  This setting determines the maximum number of HTTP/2 clients that the server can handle at once.
+
+config HTTP_SERVER_MAX_STREAMS
+	int "Max number of HTTP/2 streams"
+	default 3
+	range 1 100
+	help
+	  This setting determines the maximum number of HTTP/2 streams for each client.
+
+config MCP_SERVER_INFO_NAME_MAX_LEN
+	int "Maximum server info name length"
+	default 64
+	help
+	  Maximum length for the server name field in serverInfo.
+
+config MCP_SERVER_INFO_NAME
+	string "Server name"
+	default "Zephyr MCP Server"
+	help
+	  The name of the MCP server reported in serverInfo.
+
+config MCP_SERVER_INFO_VERSION_MAX_LEN
+	int "Maximum server info version length"
+	default 16
+	help
+	  Maximum length for the server version field in serverInfo.
+
+config MCP_SERVER_INFO_VERSION
+	string "Server version"
+	default "1.0.0"
+	help
+	  The version of the MCP server reported in serverInfo.
+
+config MCP_SERVER_INFO_TITLE
+	bool "Include server title in serverInfo"
+	default n
+	help
+	  Include optional title field in the serverInfo section.
+
+if MCP_SERVER_INFO_TITLE
+
+config MCP_SERVER_INFO_TITLE_MAX_LEN
+	int "Maximum server info title length"
+	default 64
+	help
+	  Maximum length for the server title field in serverInfo.
+
+config MCP_SERVER_INFO_TITLE_VALUE
+	string "Server title"
+	default "Zephyr MCP Server"
+	help
+	  The title of the MCP server reported in serverInfo.
+
+endif # MCP_SERVER_INFO_TITLE
+
+config MCP_SERVER_INFO_INSTRUCTIONS
+	bool "Include server instructions in serverInfo"
+	default n
+	help
+	  Include optional instructions field in the serverInfo section.
+
+if MCP_SERVER_INFO_INSTRUCTIONS
+
+config MCP_SERVER_INFO_INSTRUCTIONS_MAX_LEN
+	int "Maximum server info instructions length"
+	default 256
+	help
+	  Maximum length for the server instructions field in serverInfo.
+
+config MCP_SERVER_INFO_INSTRUCTIONS_VALUE
+	string "Server instructions"
+	default "This is a Zephyr-based MCP server providing tool capabilities."
+	help
+	  The instructions for the MCP server reported in serverInfo.
+
+endif # MCP_SERVER_INFO_INSTRUCTIONS
+
+config MCP_TOOLS_CAPABILITY
+	bool "Tools capability"
+	default y
+	help
+	  Tools capability in the MCP server. This allows the server
+	  to register and execute tools via tools/list and tools/call methods.
+
+if MCP_TOOLS_CAPABILITY
+
+config MCP_MAX_TOOLS
+	int "Maximum number of registered tools"
+	default 4
+
+config MCP_TOOL_NAME_MAX_LEN
+	int "Maximum tool name length"
+	default 32
+	help
+	  Maximum length for tool name and title fields.
+
+config MCP_TOOL_DESC
+	bool "Include tool description in tools/list response"
+	default n
+	help
+	  Include optional description field in the tools/list response.
+
+if MCP_TOOL_DESC
+
+config MCP_TOOL_DESC_MAX_LEN
+	int "Maximum tool description length"
+	default 256
+	help
+	  Maximum length for tool description field.
+
+endif # MCP_TOOL_DESC
+
+config MCP_TOOL_SCHEMA_MAX_LEN
+	int "Maximum input/output schema length"
+	default 512
+	help
+	  Maximum length for tool input and output schema fields.
+
+config MCP_TOOL_INPUT_ARGS_MAX_LEN
+	int "Maximum input argument length"
+	default 512
+	help
+	  Maximum length for tool input arguments RPC field.
+
+config MCP_TOOL_TITLE
+	bool "Include tool title field"
+	default n
+	help
+	  Include optional title field for tools. Adds memory overhead.
+
+config MCP_TOOL_OUTPUT_SCHEMA
+	bool "Include tool output schema field"
+	default n
+	help
+	  Include optional output schema field for tools. Adds memory overhead.
+
+config MCP_TOOL_RESULT_MAX_LEN
+	int "Maximum tool execution result length"
+	default 256
+	help
+	  Maximum length for tool execution result.
+
+endif # MCP_TOOLS_CAPABILITY
+
 module = MCP
 module-str = MCP Server
 source "subsys/logging/Kconfig.template.log_config"

subsys/net/lib/mcp/mcp_common.c

@@ -0,0 +1,19 @@
+/*
+ * Copyright 2025 NXP
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/kernel.h>
+#include <zephyr/logging/log.h>
+#include "mcp_common.h"
+
+void *mcp_alloc(size_t size)
+{
+	return k_malloc(size);
+}
+
+void mcp_free(void *ptr)
+{
+	k_free(ptr);
+}