esp_rmaker_params: Added an API to indicate max number of elements allowed in an array param

Author: shahpiyushv

components/esp_rainmaker/include/esp_rmaker_core.h

@@ -622,6 +622,20 @@ esp_err_t esp_rmaker_param_add_bounds(const esp_rmaker_param_t *param,
  */
 esp_err_t esp_rmaker_param_add_valid_str_list(const esp_rmaker_param_t *param, const char *strs[], uint8_t count);
 
+/** Add max count for an array parameter
+ *
+ * This can be used to put a limit on the maximum number of elements in an array.
+ *
+ * @note The RainMaker core does not check the values. It is upto the application to handle it.
+ *
+ * @param[in] param Parameter handle.
+ * @param[in] count Max number of elements allowed in the array.
+ *
+ * @return ESP_OK on success.
+ * return error in case of failure.
+ */
+esp_err_t esp_rmaker_param_add_array_max_count(const esp_rmaker_param_t *param, int count);
+
 /** Update and report a parameter
  *
  * Calling this API will update the parameter and report it to ESP RainMaker cloud.

components/esp_rainmaker/src/core/esp_rmaker_param.c

@@ -488,6 +488,30 @@ esp_err_t esp_rmaker_param_add_valid_str_list(const esp_rmaker_param_t *param, c
   return ESP_OK;
 }
 
+esp_err_t esp_rmaker_param_add_array_max_count(const esp_rmaker_param_t *param, int count)
+{
+    if (!param) {
+        ESP_LOGE(TAG, "Param handle cannot be NULL.");
+        return ESP_ERR_INVALID_ARG;
+    }
+    _esp_rmaker_param_t *_param = (_esp_rmaker_param_t *)param;
+    if (_param->val.type != RMAKER_VAL_TYPE_ARRAY) {
+        ESP_LOGE(TAG, "Only array params can have max count.");
+        return ESP_ERR_INVALID_ARG;
+    }
+    esp_rmaker_param_bounds_t *bounds = calloc(1, sizeof(esp_rmaker_param_bounds_t));
+    if (!bounds) {
+        ESP_LOGE(TAG, "Failed to allocate memory for parameter bounds.");
+        return ESP_ERR_NO_MEM;
+    }
+    bounds->max = esp_rmaker_int(count);
+    if (_param->bounds) {
+        free(_param->bounds);
+    }
+    _param->bounds = bounds;
+    return ESP_OK;
+}
+
 esp_err_t esp_rmaker_param_add_ui_type(const esp_rmaker_param_t *param, const char *ui_type)
 {
     if (!param || !ui_type) {