diff --git a/main/zh_gateway.c b/main/zh_gateway.c
index b7e6ab1..9baa802 100755
--- a/main/zh_gateway.c
+++ b/main/zh_gateway.c
@@ -1039,7 +1039,7 @@ void zh_espnow_switch_send_mqtt_json_config_message(const zh_espnow_data_t *devi
     memset(qos, 0, 4);
     sprintf(qos, "%d", device_data->payload_data.config_message.switch_config_message.qos);
     zh_json_t json = {0};
-    char buffer[512] = {0};
+    char buffer[1024] = {0};
     zh_json_init(&json);
     zh_json_add(&json, "platform", "mqtt");
     zh_json_add(&json, "name", name);