[ISSUE-14] Multiple clients write support (#16)

* [ISSUE-14] Multiple clients write support

.gitignore

@@ -5,6 +5,9 @@ tmp.js
 # Compiled
 build
 
+# Dist
+dist
+
 # Logs
 logs
 *.log

.npmignore

@@ -5,4 +5,3 @@ docs
 yarn.lock
 *.test.js
 README.md
-dist

package.json

@@ -1,6 +1,6 @@
 {
   "name": "redux-bluetooth",
-  "version": "0.1.17",
+  "version": "0.1.18",
   "description": "Redux middleware to dispatch actions via bluetooth to a peripheral store",
   "main": "build/index.js",
   "scripts": {

src/peripheral/bleno/characteristic.js

@@ -2,9 +2,11 @@ export default function Characteristic(uuid, Parent, util, descriptor, { encode,
   function ReduxCharacteristic() {
     Parent.call(this, {
       uuid,
-      properties: ['write', 'notify'],
+      properties: ['writeWithoutResponse', 'read', 'notify'],
       descriptors: [descriptor],
     });
+    this.messages = {};
+    this.maxValueSize = 20;
   }
 
   util.inherits(ReduxCharacteristic, Parent);
@@ -13,18 +15,42 @@ export default function Characteristic(uuid, Parent, util, descriptor, { encode,
   function (data, offset, withoutResponse, callback) {
     if (offset) {
       callback(this.RESULT_ATTR_NOT_LONG);
-      return;
+      return this.RESULT_ATTR_NOT_LONG;
     }
 
-    const action = decode(data);
-    this.onAction(JSON.parse(action));
+    const buffer = decode(data);
+    const id = buffer.slice(0, 9);
+    const chunk = buffer.slice(10, this.maxValueSize);
+    const message = ((this.messages[id] || '') + chunk);
+    if (message.startsWith('[[[') && message.endsWith(']]]')) {
+      const action = JSON.parse(message.slice(3, message.length - 3));
+      this.onAction(action);
+      this.messages[id] = '';
+    } else {
+      this.messages[id] = message;
+    }
 
     callback(this.RESULT_SUCCESS);
+    return this.RESULT_SUCCESS;
+  };
+
+  ReduxCharacteristic.prototype.onReadRequest = function (offset, callback) {
+    if (offset) {
+      callback(this.RESULT_ATTR_NOT_LONG, null);
+      return;
+    }
+    const configuration = encode(
+      `|||${JSON.stringify(this.configuration)}|||`,
+    );
+    callback(this.RESULT_SUCCESS, configuration);
   };
 
   ReduxCharacteristic.prototype.onSubscribe = function (maxValueSize, updateValueCallback) {
     this.maxValueSize = maxValueSize;
     this.updateValueCallback = updateValueCallback;
+    this.configuration = {
+      limit: maxValueSize,
+    };
   };
 
   ReduxCharacteristic.prototype.onUnsubscribe = function () {

src/peripheral/bleno/characteristic.test.js

@@ -16,7 +16,7 @@ let decode = null;
 
 beforeEach(() => {
   encode = jest.fn().mockReturnValue('mockEncode');
-  decode = jest.fn().mockReturnValue('{"mockDecode":"mockDecode"}');
+  decode = jest.fn().mockReturnValue('123456789:]]]');
 });
 
 afterEach(() => {
@@ -25,15 +25,21 @@ afterEach(() => {
 });
 
 test('new Characteristic', () => {
-  const characteristic = Characteristic('mockUUID', Parent, util, 'mockDescriptor', { encode, decode });
+  const characteristic = Characteristic('mockUUID', Parent, util, 'mockDescriptor', {
+    encode,
+    decode,
+  });
 
   expect(characteristic.uuid).toBe('mockUUID');
-  expect(characteristic.properties).toEqual(['write', 'notify']);
+  expect(characteristic.properties).toEqual(['writeWithoutResponse', 'read', 'notify']);
   expect(characteristic.descriptors).toEqual(['mockDescriptor']);
 });
 
 test('Characteristic.onWriteRequest: RESULT_ATTR_NOT_LONG', () => {
-  const characteristic = Characteristic('mockUUID', Parent, util, 'mockDescriptor', { encode, decode });
+  const characteristic = Characteristic('mockUUID', Parent, util, 'mockDescriptor', {
+    encode,
+    decode,
+  });
 
   const callback = jest.fn();
   characteristic.onWriteRequest(null, true, false, callback);
@@ -41,28 +47,68 @@ test('Characteristic.onWriteRequest: RESULT_ATTR_NOT_LONG', () => {
   expect(callback).toBeCalledWith('RESULT_ATTR_NOT_LONG');
 });
 
-
-test('Characteristic.onWriteRequest: RESULT_SUCCESS', () => {
+test('Characteristic.onWriteRequest: RESULT_SUCCESS / Chunk', () => {
   let callback = null;
-  const characteristic = Characteristic('mockUUID', Parent, util, 'mockDescriptor', { encode, decode });
+  const characteristic = Characteristic('mockUUID', Parent, util, 'mockDescriptor', {
+    encode,
+    decode,
+  });
 
   callback = jest.fn();
   const spyOnAction = jest.spyOn(characteristic, 'onAction');
   characteristic.onWriteRequest(null, false, false, callback);
 
-  expect(spyOnAction).toBeCalledWith({ mockDecode: 'mockDecode' });
-  expect(callback).toBeCalledWith('RESULT_SUCCESS');
-
-  callback = jest.fn();
-  characteristic.onAction = jest.fn();
-  characteristic.onWriteRequest(null, false, false, callback);
-
-  expect(characteristic.onAction).toBeCalledWith({ mockDecode: 'mockDecode' });
+  expect(spyOnAction).not.toBeCalled();
+  expect(characteristic.messages[123456789]).toEqual(']]]');
   expect(callback).toBeCalledWith('RESULT_SUCCESS');
 });
 
+test('Characteristic.onWriteRequest: RESULT_SUCCESS / Message', () => {
+  let callback = null;
+  const characteristic = Characteristic('mockUUID', Parent, util, 'mockDescriptor', {
+    encode,
+    decode,
+  });
+
+  callback = jest.fn();
+  const spyOnAction = jest.spyOn(characteristic, 'onAction');
+  characteristic.messages[123456789] = '[[[{"mockDecode":"mockDecode"}';
+  characteristic.onWriteRequest(null, false, false, callback);
+
+  expect(spyOnAction).toBeCalledWith({ mockDecode: 'mockDecode' });
+  expect(characteristic.messages[123456789]).toEqual('');
+  expect(callback).toBeCalledWith('RESULT_SUCCESS');
+});
+
+test('Characteristic.onReadRequest: RESULT_ATTR_NOT_LONG', () => {
+  const characteristic = Characteristic('mockUUID', Parent, util, 'mockDescriptor', {
+    encode,
+    decode,
+  });
+
+  const callback = jest.fn();
+  characteristic.onReadRequest(true, callback);
+
+  expect(callback).toBeCalledWith('RESULT_ATTR_NOT_LONG', null);
+});
+
+test('Characteristic.onReadRequest: RESULT_SUCCESS', () => {
+  const characteristic = Characteristic('mockUUID', Parent, util, 'mockDescriptor', {
+    encode,
+    decode,
+  });
+
+  const callback = jest.fn();
+  characteristic.onReadRequest(false, callback);
+
+  expect(callback).toBeCalledWith('RESULT_SUCCESS', 'mockEncode');
+});
+
 test('Characteristic.onSubscribe', () => {
-  const characteristic = Characteristic('mockUUID', Parent, util, 'mockDescriptor', { encode, decode });
+  const characteristic = Characteristic('mockUUID', Parent, util, 'mockDescriptor', {
+    encode,
+    decode,
+  });
 
   characteristic.onSubscribe(null, 'mockUpdateValueCallback');
 
@@ -70,7 +116,10 @@ test('Characteristic.onSubscribe', () => {
 });
 
 test('Characteristic.onUnsubscribe', () => {
-  const characteristic = Characteristic('mockUUID', Parent, util, 'mockDescriptor', { encode, decode });
+  const characteristic = Characteristic('mockUUID', Parent, util, 'mockDescriptor', {
+    encode,
+    decode,
+  });
 
   characteristic.onSubscribe(null, 'mockUpdateValueCallback');
   characteristic.onUnsubscribe();
@@ -79,7 +128,10 @@ test('Characteristic.onUnsubscribe', () => {
 });
 
 test('Characteristic.updateState', () => {
-  const characteristic = Characteristic('mockUUID', Parent, util, 'mockDescriptor', { encode, decode });
+  const characteristic = Characteristic('mockUUID', Parent, util, 'mockDescriptor', {
+    encode,
+    decode,
+  });
 
   characteristic.updateState({ mockState: 'mockState' });
 

src/webapp/central/central.js

@@ -1,4 +1,5 @@
 export default function Central(
+  id,
   bluetooth,
   { encode, decode },
   { SERVICE_UUID, CHARACTERISTIC_UUID }) {
@@ -6,6 +7,10 @@ export default function Central(
     server: null,
     characteristic: null,
     message: '',
+    configuration: {
+      limit: 20,
+    },
+    id,
   };
 
   const connect = name => bluetooth
@@ -22,29 +27,58 @@ export default function Central(
         state.characteristic = characteristic;
       });
 
-  const handler = callback => state.characteristic.startNotifications().then(() => {
-    const listerner = (event) => {
+  const listener = callback => (event) => {
     const chunk = decode(event.target.value);
     const message = `${state.message}${chunk}`;
-
     if (message.startsWith('[[[') && message.endsWith(']]]')) {
       const json = JSON.parse(message.slice(3, message.length - 3));
       callback(json);
       state.message = '';
+    } else if (message.startsWith('|||') && message.endsWith('|||')) {
+      state.message = '';
     } else {
       state.message = message;
     }
+    return state.message;
   };
-    state.characteristic.addEventListener('characteristicvaluechanged', listerner);
-    return listerner;
+
+  const handler = callback => state.characteristic.startNotifications()
+    .then(() => {
+      const eventListener = listener(callback);
+      state.characteristic.addEventListener('characteristicvaluechanged', eventListener);
+      return state.characteristic.readValue();
+    }).then((data) => {
+      const configuration = decode(data);
+      state.configuration = JSON.parse(configuration.slice(3, configuration.length - 3));
+      return state.configuration;
     });
 
   const write = (action) => {
-    if (!state.server || !state.server.connected || !state.characteristic) return null;
-    const stringify = JSON.stringify(action);
-    const serialized = encode(stringify);
+    if (!state.server || !state.server.connected || !state.characteristic) return Promise.reject();
+    const stringify = `[[[${JSON.stringify(action)}]]]`;
+    const message = encode(stringify);
+    const key = encode(`${state.id}:`);
+    const dataSize = state.configuration.limit - key.length;
+    const writes = [];
 
-    return state.characteristic.writeValue(serialized);
+
+    let i = 0;
+    do {
+      const next = i + dataSize;
+      const end = Math.min(next, message.length);
+      const data = message.slice(i, end);
+      const buffer = new Uint8Array(key.length + data.length);
+      buffer.set(key, 0);
+      buffer.set(data, key.length);
+      writes.push(buffer);
+
+      i = next;
+    } while (i < message.length);
+
+    // Serialize Promises
+    return writes.reduce((promise, chunk) =>
+      promise.then(() => state.characteristic.writeValue(chunk)),
+      Promise.resolve());
   };
 
   return {
@@ -52,5 +86,6 @@ export default function Central(
     connect,
     handler,
     write,
+    listener,
   };
 }

src/webapp/central/central.test.js

@@ -36,7 +36,7 @@ const bluetooth = {
 let central = null;
 
 beforeEach(() => {
-  central = new Central(bluetooth, encoder, CENTRAL_CONFIG);
+  central = new Central(123, bluetooth, encoder, CENTRAL_CONFIG);
 });
 
 afterEach(() => {
@@ -60,44 +60,87 @@ test('Central: connect', () => {
 
 test('Central: handler', () => {
   const callback = jest.fn();
-  expect.assertions(3);
+  expect.assertions(4);
 
   const promise = central.connect('mockName').then(() => central.handler(callback))
-  .then((listerner) => {
+  .then((configuration) => {
+    expect(configuration).toEqual({ mockDecode: 'mockDecode' });
     expect(characteristic.startNotifications).toBeCalled();
-    listerner({ target: { value: 'mockEvent' } });
-    expect(callback).toBeCalledWith({ mockDecode: 'mockDecode' });
+    expect(characteristic.readValue).toBeCalled();
     return true;
   });
 
   return expect(promise).resolves.toBe(true);
 });
 
-test('Central: handler chunk', () => {
+test('Central: listener - chunk message', () => {
   const callback = jest.fn();
   expect.assertions(3);
 
   encoder.decode = jest.fn().mockReturnValue('{"mockDecode":"mockDecode"}');
-  central = new Central(bluetooth, encoder, CENTRAL_CONFIG);
+  central = new Central(123, bluetooth, encoder, CENTRAL_CONFIG);
 
-  const promise = central.connect('mockName').then(() => central.handler(callback))
-  .then((listerner) => {
-    expect(characteristic.startNotifications).toBeCalled();
-    listerner({ target: { value: 'mockEvent' } });
-    expect(callback.mock.calls.length).toEqual(0);
+  const promise = central.connect('mockName')
+  .then(() => {
+    const listener = central.listener(callback);
+    const message = listener({ target: { value: 'mockEvent' } });
+    expect(callback).not.toBeCalled();
+    expect(message).toEqual('{"mockDecode":"mockDecode"}');
     return true;
   });
 
   return expect(promise).resolves.toBe(true);
 });
 
-test('Central: write', () => {
+test('Central: listener - complete message', () => {
+  const callback = jest.fn();
+  expect.assertions(3);
+
+  encoder.decode = jest.fn().mockReturnValue('[[[{"mockDecode":"mockDecode"}]]]');
+  central = new Central(123, bluetooth, encoder, CENTRAL_CONFIG);
+
+  const promise = central.connect('mockName')
+  .then(() => {
+    const listener = central.listener(callback);
+    const message = listener({ target: { value: 'mockEvent' } });
+    expect(callback).toBeCalledWith({ mockDecode: 'mockDecode' });
+    expect(message).toEqual('');
+    return true;
+  });
+
+  return expect(promise).resolves.toBe(true);
+});
+
+test('Central: listener - internal message', () => {
+  const callback = jest.fn();
+  expect.assertions(3);
+
+  encoder.decode = jest.fn().mockReturnValue('|||{"mockDecode":"mockDecode"}|||');
+  central = new Central(123, bluetooth, encoder, CENTRAL_CONFIG);
+
+  const promise = central.connect('mockName')
+  .then(() => {
+    const listener = central.listener(callback);
+    const message = listener({ target: { value: 'mockEvent' } });
+    expect(callback).not.toBeCalled();
+    expect(message).toEqual('');
+    return true;
+  });
+
+  return expect(promise).resolves.toBe(true);
+});
+
+test('Central: write - empty message', () => {
   expect.assertions(2);
 
+  encoder.encode = jest.fn().mockReturnValue([1, 2, 3, 4, 5, 6, 7, 8, 9, 0]);
+  central = new Central(123, bluetooth, encoder, CENTRAL_CONFIG);
+
   const promise = central.connect('mockName')
   .then(() => central.write({ type: 'ACTION' }))
   .then(() => {
-    expect(characteristic.writeValue).toBeCalledWith('mockEncode');
+    expect(characteristic.writeValue)
+    .toBeCalledWith(new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0]));
     return true;
   });
 

src/webapp/central/index.js

@@ -7,6 +7,7 @@ import Central from './central';
 const { navigator, TextDecoder, TextEncoder } = window;
 
 export default new Central(
+  `${Date.now()}`.slice(4, 13), // Client ID
   navigator.bluetooth,
   Encoder({ TextEncoder, TextDecoder }),
   CENTRAL_CONFIG,

src/webapp/central/index.test.js

@@ -11,6 +11,7 @@ global.navigator = { bluetooth: null };
 
 test('central', () => {
   const result = new Central(
+    123,
     null,
     true,
     CENTRAL_CONFIG,