Features supported:
- CoAP over UDP RFC 7252.
- CoAP over TCP/TLS RFC 8232
- Observe resources in CoAP RFC 7641
- Block-wise transfers in COAP RFC 7959
- request multiplexer
- multicast
Not yet implemented:
- CoAP over DTLS
// Server
// See /examples/simple/server/main.go
func handleA(w coap.ResponseWriter, req *coap.Request) {
log.Printf("Got message in handleA: path=%q: %#v from %v", req.Msg.Path(), req.Msg, req.Client.RemoteAddr())
w.SetContentFormat(coap.TextPlain)
log.Printf("Transmitting from A")
if _, err := w.Write([]byte("hello world")); err != nil {
log.Printf("Cannot send response: %v", err)
}
}
func main() {
mux := coap.NewServeMux()
mux.Handle("/a", coap.HandlerFunc(handleA))
log.Fatal(coap.ListenAndServe(":5688", "udp", mux))
// for tcp
// log.Fatal(coap.ListenAndServe(":5688", "tcp", mux))
// fot tcp-tls
// log.Fatal(coap.ListenAndServeTLS(":5688", CertPEMBlock, KeyPEMBlock, mux))
} // Client
// See /examples/simpler/client/main.go
func main() {
co, err := coap.Dial("udp", "localhost:5688")
// for tcp
// co, err := coap.Dial("tcp", "localhost:5688")
// for tcp-tls
// co, err := coap.DialWithTLS("localhost:5688", &tls.Config{InsecureSkipVerify: true})
if err != nil {
log.Fatalf("Error dialing: %v", err)
}
resp, err := co.Get(path)
if err != nil {
log.Fatalf("Error sending request: %v", err)
}
log.Printf("Response payload: %v", resp.Payload())
}Look to examples/observe/server/main.go
Look to examples/observe/client/main.go
Look to examples/mcast/server/main.go
Look to examples/mcast/client/main.go
MIT