test.nim

    proc gen_event(ad: AddressDirection) {.async.} =
  
      let href = ("http://$1:$2/sub$3" % [ cts.host, $cts.port, $sid ])
      let ev = %* CallEventNotification(
        callingParticipant: calling,
        calledParticipant: called,
        eventDescription: EventDescription(callEvent: evtype),
        notificationType: "callEvent",
        callSessionIdentifier: $ id,
        addressDirection: ad,
        link: Link(rel: "callEventSubscription", href: href)
      )
      let evp = ev.pretty()

      debug("tx> " & evp)

      let url = ces.callbackReference.notifyURL
      let c = newAsyncHttpCLient()
      let req = c.post(url, body = evp)
      if await withTimeout(req, 1000):
        yield req
        if req.failed:
          # do stuff
        let r = req.read()
        if r.code() != Http204:
          error r.status
        else:
          debug "rx> " & await r.body
      else:
        warn("timeout")