Bidirectional msgpack wire protocol with unpack support

lib/wire/wire.go

@@ -9,7 +9,8 @@ import (
 
 var HashKey = [8]byte{}
 
-type RebootingBootsel struct{}
+type ResponseBOOTSEL struct{}
+type RequestBOOTSEL struct{}
 
 type Envelope struct {
 	Checksum uint32
@@ -18,7 +19,23 @@ type Envelope struct {
 
 func init() {
 	msgpack.RegisterExt(0, (*Envelope)(nil))
-	msgpack.RegisterExt(1, (*RebootingBootsel)(nil))
+	msgpack.RegisterExt(1, (*ResponseBOOTSEL)(nil))
+	msgpack.RegisterExt(2, (*RequestBOOTSEL)(nil))
+}
+
+func EncodeMessage(msg any) ([]byte, error) {
+	payload, err := msgpack.Marshal(msg)
+	if err != nil {
+		return nil, fmt.Errorf("encode inner: %w", err)
+	}
+
+	checksum := halfsiphash.Sum32(payload, HashKey)
+	env := Envelope{Checksum: checksum, Payload: payload}
+	data, err := msgpack.Marshal(&env)
+	if err != nil {
+		return nil, fmt.Errorf("encode envelope: %w", err)
+	}
+	return data, nil
 }
 
 func DecodeMessage(data []byte) (any, error) {