Add debug log ring buffer with timestamps, log CLI subcommand

lib/client/types.go

@@ -13,6 +13,17 @@ type ResponseInfo struct {
 	FirmwareName string
 }
 
+type RequestLog struct{}
+
+type LogEntry struct {
+	TimestampUS uint32
+	Message     string
+}
+
+type ResponseLog struct {
+	Entries []LogEntry
+}
+
 type RequestTest struct {
 	Name string
 }
@@ -44,6 +55,8 @@ func init() {
 	msgpack.RegisterExt(3, (*ResponsePICOBOOT)(nil))
 	msgpack.RegisterExt(4, (*RequestInfo)(nil))
 	msgpack.RegisterExt(5, (*ResponseInfo)(nil))
+	msgpack.RegisterExt(6, (*RequestLog)(nil))
+	msgpack.RegisterExt(7, (*ResponseLog)(nil))
 	msgpack.RegisterExt(127, (*RequestTest)(nil))
 	msgpack.RegisterExt(126, (*ResponseTest)(nil))
 }