Add get history message

src/common.ts

@@ -8,5 +8,5 @@ export enum MessageTypes {
   UserDataRequest = 0x0002,
   UserDataResponse = 0x0003,
   Keepalive = 0x0005,
-  Unsubscribe = 0xFFFF
+  GetHistory = 0xfffe,
 }

src/mapping.ts

@@ -1,9 +1,4 @@
-import { packSubscribeMessage } from './messages/subscribe'
-import { packBasicMessage, unpackBasicMessage } from './messages/basic'
-import { packUserDataRequestMessage, unpackUserDataRequestMessage } from './messages/userDataRequest'
-import { packUserDataResponseMessage, unpackUserDataResponseMessage } from './messages/userDataResponse'
-import { packKeepaliveMessage } from './messages/keepalive'
-import { packUnsubscribeMessage } from './messages/unsubscribe'
+import { packGetHistoryMessage } from "./messages/history";
 
 export const packers = {
   0x0000: packSubscribeMessage,
@@ -11,8 +6,8 @@ export const packers = {
   0x0002: packUserDataRequestMessage,
   0x0003: packUserDataResponseMessage,
   0x0005: packKeepaliveMessage,
-  0xffff: packUnsubscribeMessage
-}
+  0xfffe: packGetHistoryMessage,
+  0xffff: packUnsubscribeMessage,
 
 export const unpackers = {
   0x0001: unpackBasicMessage,

src/messages/history.ts

@@ -0,0 +1,16 @@
+import { MessageTypes } from "../common";
+import { numberToUint16BE } from "../utilities/number";
+import { packOutgoingPacket } from "./packet";
+
+const MESSAGE_TYPE = numberToUint16BE(MessageTypes.Keepalive);
+
+/**
+ * Create an outgoing keepalive (0x0005) packet.
+ * @returns An outgoing keepalive (0x0005) packet.
+ */
+export function packGetHistoryMessage(): Uint8Array {
+  return packOutgoingPacket({
+    messageType: MESSAGE_TYPE,
+    data: new Uint8Array(0),
+  });
+}