Zigbee example: add rcp and gateway

* provide Zigbee rcp and Zigbee gateway example
 * minor comment fix for light example

examples/zigbee/esp_zigbee_gateway/main/esp_zigbee_gateway.h

@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2021 Espressif Systems (Shanghai) CO LTD
+ * All rights reserved.
+ *
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form, except as embedded into a Espressif Systems
+ *    integrated circuit in a product or a software update for such product,
+ *    must reproduce the above copyright notice, this list of conditions and
+ *    the following disclaimer in the documentation and/or other materials
+ *    provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * 4. Any software provided in binary form under this license must not be reverse
+ *    engineered, decompiled, modified and/or disassembled.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "esp_err.h"
+#include "zboss_api.h"
+
+/* Zigbee Configuration */
+#define IEEE_CHANNEL_MASK               (1l << 13)  /* ZigBee default setting is channel 13 for light example usage */
+#define ERASE_PERSISTENT_CONFIG         ZB_TRUE     /* erase network devices before running example */
+#define MAX_CHILDREN                    10          /* the max amount of connected devices */
+
+#define ZB_ESP_DEFAULT_RADIO_CONFIG()                           \
+    {                                                           \
+        .radio_mode = RADIO_MODE_UART_RCP,                      \
+            .radio_uart_config = {                              \
+            .port = 1,                                          \
+            .uart_config =                                      \
+                {                                               \
+                    .baud_rate = 115200,                        \
+                    .data_bits = UART_DATA_8_BITS,              \
+                    .parity = UART_PARITY_DISABLE,              \
+                    .stop_bits = UART_STOP_BITS_1,              \
+                    .flow_ctrl = UART_HW_FLOWCTRL_DISABLE,      \
+                    .rx_flow_ctrl_thresh = 0,                   \
+                    .source_clk = UART_SCLK_APB,                \
+                },                                              \
+            .rx_pin = 4,                                        \
+            .tx_pin = 5,                                        \
+        },                                                      \
+    }
+
+#define ZB_ESP_DEFAULT_HOST_CONFIG()                            \
+    {                                                           \
+        .host_connection_mode = HOST_CONNECTION_MODE_NONE,      \
+    }