fw: app: update: Add source file and HTTP 204 handler

This adds the HTTP PUT /update handler which just returns HTTP 204 No
Content.

This is the minimal first step towards a working /update handler.

4 files changed, 56 insertions, 0 deletions

diff --git a/fw/app/CMakeLists.txt b/fw/app/CMakeLists.txt
index 47f75f6..1a9d1cf 100644
--- a/fw/app/CMakeLists.txt
+++ b/fw/app/CMakeLists.txt
@@ -21,6 +21,13 @@ target_sources(app
 		"${CMAKE_CURRENT_SOURCE_DIR}/src/heart.c"
 )
 
+target_sources_ifdef(
+	CONFIG_IOT_CONTACT_REMOTE_UPDATE
+	app
+	PRIVATE
+		"${CMAKE_CURRENT_SOURCE_DIR}/src/update.c"
+)
+
 zephyr_linker_sources(SECTIONS sections-rom.ld)
 zephyr_linker_section(NAME http_resource_desc_http_service
                       KVMA RAM_REGION GROUP RODATA_REGION
diff --git a/fw/app/Kconfig b/fw/app/Kconfig
new file mode 100644
index 0000000..5393e05
--- /dev/null
+++ b/fw/app/Kconfig
@@ -0,0 +1,5 @@
+config IOT_CONTACT_REMOTE_UPDATE
+	bool "Enable the remote update system"
+	default n
+
+source "Kconfig.zephyr"
diff --git a/fw/app/boards/nucleo_f767zi.conf b/fw/app/boards/nucleo_f767zi.conf
index 8170e29..7f92421 100644
--- a/fw/app/boards/nucleo_f767zi.conf
+++ b/fw/app/boards/nucleo_f767zi.conf
@@ -2,6 +2,8 @@
 # v. 2.0. If a copy of the MPL was not distributed with this file, You can
 # obtain one at https://mozilla.org/MPL/2.0/.
 
+CONFIG_IOT_CONTACT_REMOTE_UPDATE=y
+
 CONFIG_BOOTLOADER_MCUBOOT=y
 
 CONFIG_FLASH=y
diff --git a/fw/app/src/update.c b/fw/app/src/update.c
new file mode 100644
index 0000000..13471d2
--- /dev/null
+++ b/fw/app/src/update.c
@@ -0,0 +1,42 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public License,
+ * v. 2.0. If a copy of the MPL was not distributed with this file, You can
+ * obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+
+#include <zephyr/logging/log.h>
+#include <zephyr/net/http/server.h>
+#include <zephyr/net/http/service.h>
+
+LOG_MODULE_REGISTER(update);
+
+
+static int update_handler(
+	struct http_client_ctx *client,
+	enum http_data_status status,
+	const struct http_request_ctx *request_ctx,
+	struct http_response_ctx *response_ctx,
+	void *user_data
+) {
+	LOG_DBG("Handling update request");
+
+	response_ctx->body = NULL;
+	response_ctx->body_len = 0;
+	response_ctx->final_chunk = true;
+	response_ctx->status = HTTP_204_NO_CONTENT;
+
+	LOG_DBG("Update request handled");
+	return 0;
+}
+
+static struct http_resource_detail_dynamic update_resource_detail = {
+	.common = {
+			.type = HTTP_RESOURCE_TYPE_DYNAMIC,
+			.bitmask_of_supported_http_methods = BIT(HTTP_GET),
+		},
+	.cb = update_handler,
+	.user_data = NULL,
+};
+
+HTTP_RESOURCE_DEFINE(update_resource, http_service, "/update", &update_resource_detail);