func main() {
    // make persistent connection
    tx := &smpp.Transmitter{
        Addr:   "localhost:2775",
        User:   "foobar",
        Passwd: "secret",
    }
    conn := tx.Bind()
    // check initial connection status
    var status smpp.ConnStatus
    if status = <-conn; status.Error() != nil {
        log.Fatalln("Unable to connect, aborting:", status.Error())
    }
    log.Println("Connection completed, status:", status.Status().String())
    // example of connection checker goroutine
    go func() {
        for c := range conn {
            log.Println("SMPP connection status:", c.Status())
        }
    }()
    // example of sender handler func
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        sm, err := tx.Submit(&smpp.ShortMessage{
            Src:      r.FormValue("src"),
            Dst:      r.FormValue("dst"),
            Text:     pdutext.Raw(r.FormValue("text")),
            Register: pdufield.NoDeliveryReceipt,
            TLVFields: pdutlv.Fields{
                pdutlv.TagReceiptedMessageID: pdutlv.CString(r.FormValue("msgId")),
            },
        })
        if err == smpp.ErrNotConnected {
            http.Error(w, "Oops.", http.StatusServiceUnavailable)
            return
        }
        if err != nil {
            http.Error(w, err.Error(), http.StatusBadRequest)
            return
        }
        io.WriteString(w, sm.RespID())
    })
    log.Fatal(http.ListenAndServe(":8080", nil))
}