esphome sntp offline fixes

esphome/common/network_common.yaml

@@ -37,6 +37,8 @@ substitutions:
 wifi:
   ssid: ${wifi_ssid}
   password: ${wifi_password}
+  #enable_rrm: true           # (ESP32 only) enable 802.11k Radio Resource Management
+  #enable_btm: true           # (ESP32 only) enable 802.11v BSS Transition Management
   #power_save_mode: LIGHT   # https://esphome.io/components/wifi.html#wifi-power-save-mode
   manual_ip: # optional static IP address
     static_ip: ${local_static_ip_address}