code: public String getFullTangoHost() throws DevFailed {
          //  Get the tango_host
          String  tangoHost = get_tango_host();
          String  host = tangoHost.substring(0, tangoHost.indexOf(':'));
          String  port = tangoHost.substring(tangoHost.indexOf(':'));
          host = TangoUrl.getCanonicalName(host);
          return host+port;
  	}
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