Add OTA to the device dashboard. Implement for H5

src/ota.h

@@ -0,0 +1,35 @@
+// Copyright (c) 2023 Cesanta Software Limited
+// All rights reserved
+
+#pragma once
+
+#include "arch.h"
+
+#define MG_OTA_NONE 0      // No OTA support
+#define MG_OTA_STM32H5 1   // STM32 H5 series
+#define MG_OTA_CUSTOM 100  // Custom implementation
+
+#define MG_OTA_MAGIC 0xb07afeed
+
+#ifndef MG_OTA
+#define MG_OTA MG_OTA_NONE
+#endif
+
+// Firmware update API
+bool mg_ota_begin(size_t new_firmware_size);     // Start writing
+bool mg_ota_write(const void *buf, size_t len);  // Write firmware chunk
+bool mg_ota_end(void);                           // Stop writing
+void mg_sys_reset(void);                         // Reboot device
+
+struct mg_ota_data {
+  uint32_t magic;   // Must be MG_OTA_MAGIC
+  uint32_t crc32;   // Checksum of the current firmware
+  uint32_t size;    // Firware size
+  uint32_t time;    // Flashing timestamp. Unix epoch, seconds since 1970
+  uint32_t booted;  // -1: not yet booted before, otherwise booted
+  uint32_t golden;  // -1: not yet comitted, otherwise clean, committed
+};
+
+bool mg_ota_status(struct mg_ota_data[2]);  // Get status for curr and prev fw
+bool mg_ota_commit(void);                   // Commit current firmware
+bool mg_ota_rollback(void);                 // Rollback to prev firmware