feat(ESPAT-2082): Added a http_get_to_fatfs example

components/at/include/esp_at_core.h

@@ -453,4 +453,39 @@ const uint8_t* esp_at_get_current_cmd_name(void);
  */
 int32_t esp_at_get_core_version(char *buffer, uint32_t size);
 
+/**
+ * @brief Mount FATFS partition
+ *
+ * @note if you want to use FATFS, you should enable "AT FS command support" in menuconfig first.
+ * @note esp-at uses a fixed partition for the filesystem, which defined in esp-at/module_config/<your_module_config>/at_customize.csv,
+ *       and uses a fixed mount point "/fatfs".
+ * @note when using FATFS, you should call this function to mount the partition first,
+ *       and call at_fatfs_unmount() to unmount the partition when you don't need it.
+ *
+ * @return
+ * - true : succeed
+ * - false : fail
+*/
+bool at_fatfs_mount(void);
+
+/**
+ * @brief Unmount FATFS partition
+ *
+ * @return
+ * - true : succeed
+ * - false : fail
+*/
+bool at_fatfs_unmount(void);
+
+/**
+ * @brief Check if the string is NULL
+ *
+ * @param str: the string to be checked
+ *
+ * @return
+ * - true : the string is NULL
+ * - false : the string is not NULL
+ */
+bool at_str_is_null(uint8_t *str);
+
 void at_handle_result_code(esp_at_result_code_string_index code, void *pbuf);

examples/at_http_get_to_fatfs/CMakeLists.txt

@@ -0,0 +1,14 @@
+
+file(GLOB_RECURSE srcs *.c)
+
+set(includes "include")
+
+# Add more required components you need here, separated by spaces
+set(require_components at freertos nvs_flash)
+
+idf_component_register(
+    SRCS ${srcs}
+    INCLUDE_DIRS ${includes}
+    REQUIRES ${require_components})
+
+target_link_libraries(${COMPONENT_LIB} INTERFACE "-u esp_at_custom_cmd_register")

examples/at_http_get_to_fatfs/README.md

@@ -0,0 +1,43 @@
+### Usage
+1. Add this `at_http_get_to_fatfs` component into the build system of esp-at project.
+
+- Linux or macOS
+```
+export AT_CUSTOM_COMPONENTS=(path_of_at_custom_cmd)
+```
+
+- Windows
+```
+set AT_CUSTOM_COMPONENTS=(path_of_at_custom_cmd)
+```
+
+Notes:
+- You need to replace (path_of_at_custom_cmd) with your real absolute path of your `at_custom_cmd` directory.
+- You can specify multiple components. For example: `export AT_CUSTOM_COMPONENTS="~/prefix/my_path1 ~/prefix/my_path2"`.
+
+2. Compile your firmware according to the [Compile ESP-AT Project](https://docs.espressif.com/projects/esp-at/en/latest/esp32/Compile_and_Develop/How_to_clone_project_and_compile_it.html#compile-esp-at-project-locally) guide.
+
+3. Send a new AT command based on your situation.
+
+The new command format is:
+```
+AT+HTTPGET_TO_FS=<"dst_path">,<url_len>
+```
+where:
+- <"dst_path">: Specify the destination path where the file will be stored on the filesystem after the HTTP GET request is successfully executed.
+- <url_len>: URL length. Maximum: 8192 bytes.
+
+For example: url is "http://192.168.200.249:8080/a.bin", and you want to save it to `foo.bin`.
+```
+AT+HTTPGET_TO_FS="foo.bin",33
+// then input http://192.168.200.249:8080/a.bin
+```
+
+4. Check the file content
+
+Please send [AT+FS](https://docs.espressif.com/projects/esp-at/en/latest/esp32/AT_Command_Set/FS_AT_Commands.html#at-fs-filesystem-operations) command to read the data of your <"dst_path">.
+
+For example: read 100 bytes from offset 0 of `foo.bin` file.
+```
+AT+FS=0,2,"foo.bin",0,100
+```