
   STOP WHEN FAILURE CHECKS
  ==========================

  
  We check the path before going further
  
  (stop-if-error
    (=> sms-from-usb-phone ping 
        :host "192.168.1.1" :desc "my router")
    ;; ^ no internet, send SMS from phone
  
    (=> sms-web-api ping 
        :host "my-mail-server.com")
    ;; ^ we can use sms from web as we have network
  
    (=> mail ping :host "dataswamp.org")
    (=> mail ping :host "bitreich.org"))
    ;; ^ we can use mail as we ping the mail server
  
