Add message IDs, transport interface, client package, extract protocol headers

lib/client/types.go

@@ -0,0 +1,28 @@
+package client
+
+import "github.com/theater/picomap/lib/msgpack"
+
+type ResponseBOOTSEL struct{}
+type RequestBOOTSEL struct{}
+
+type DeviceError struct {
+	Code    uint32
+	Message string
+}
+
+func (e *DeviceError) Error() string {
+	return e.Message
+}
+
+type Envelope struct {
+	MessageID uint32
+	Checksum  uint32
+	Payload   []byte
+}
+
+func init() {
+	msgpack.RegisterExt(0, (*Envelope)(nil))
+	msgpack.RegisterExt(1, (*ResponseBOOTSEL)(nil))
+	msgpack.RegisterExt(2, (*RequestBOOTSEL)(nil))
+	msgpack.RegisterExt(3, (*DeviceError)(nil))
+}