uni-app ios app写入特征值无法正确返回结果

详细问题描述

（DCloud产品不会有明显的bug，所以你遇到的问题大都是在特定环境下才能重现的问题，请仔细描述你的环境和重现方式，否则DCloud很难排查解决你的问题）

1. 调用uni.notifyBLECharacteristicValueChange会触发uni.onBLECharacteristicValueChange，并会返回上一次uni.writeBLECharacteristicValue后的返回结果

2. 在1.9.7之前的版本调用uni.writeBLECharacteristicValue后，不会触发uni.onBLECharacteristicValueChange，但在调用uni.writeBLECharacteristicValue后马上执行uni.readBLECharacteristicValue会触发uni.onBLECharacteristicValueChange，在onBLECharacteristicValueChange中也能获得正确的返回结果；在1.9.7后，调用uni.writeBLECharacteristicValue可以正常触发uni.onBLECharacteristicValueChange，但在onBLECharacteristicValueChange无法返回正确的结果，一直返回空值

3. uni.writeBLECharacteristicValue在真机调试和越狱包都执行正常，但上架到app store后只能偶尔几次写入成功，但不管是否写入成功都会返回ok，从蓝牙设备的响应可以看出是否写入成功。

4. 以上问题均只在IOS的app里出现，安卓都正常

重现步骤

示例代码

uni.onBLECharacteristicValueChange(function(e) {
	console.log('onBLECharacteristicValueChange:' + util.buf2hex(e.value).trim());
	Param.stateChangeBack('onBLECharacteristicValueChange:' + util.buf2hex(e.value).trim());
	var result = util.buf2hex(e.value).trim();
	if (Param.writeOk)
		success(result);
});

function writeCharacteristics(cmds) {
	Param.stateChangeBack('writeCharacteristics');
	for (var i = 0; i < cmds.length; i++) {
		console.log('cmd:' + util.buf2hex(cmds[i]));
		Param.stateChangeBack('cmd:' + util.buf2hex(cmds[i]));

		uni.writeBLECharacteristicValue({
			deviceId: Param.lockNo.toUpperCase(),
			serviceId: Param.serviceUuid.toUpperCase(),
			characteristicId: Param.characterUuid.toUpperCase(),
			value: cmds[i],
			success: function(e) {
				console.log('write characteristics success: ' + JSON.stringify(e));
				Param.stateChangeBack('write characteristics success: ' + JSON.stringify(e));
			},
			fail: function(e) {
				console.log('write characteristics failed: ' + JSON.stringify(e));
				Param.stateChangeBack('write characteristics failed: ' + JSON.stringify(e));
				//failure(FailMsg.WRITEVALUEFAIL);
				if (Param.doIndex < 10) {
					Param.doIndex++;
					setTimeout(() => {
						writeCharacteristics(Param.bleCmd);
					}, 200);
				}
			}
		});
	}
}

运行日志：

21:42:38.807  open adapter success: {"errMsg":"openBluetoothAdapter:ok"}
21:42:38.828  startBluetoothDevicesDiscovery success:{"errMsg":"startBluetoothDevicesDiscovery:ok"}
21:42:38.848  onBluetoothAdapterStateChange: {"available":true,"discovering":false}
21:42:38.869  startBluetoothDevicesDiscovery success:{"errMsg":"startBluetoothDevicesDiscovery:ok"}
21:42:38.889  onBluetoothDeviceFound: {"devices":[{"RSSI":-52,"advertisServiceUUIDs":["6E400001-B5A3-F393-E0A9-DEAFD37C1A10"],"deviceId":"9A48D668-F275-8C7A-6BFE-F14D01B49CAA","localName":"000-102","name":"000-102"}]}
21:42:38.930  stopBluetoothDiscovery
21:42:38.971  start connect
21:42:38.992  stop Discovery success: {"errMsg":"stopBluetoothDevicesDiscovery:ok"}
21:42:39.012  onBluetoothAdapterStateChange: {"available":true,"discovering":false}
21:42:39.833  onBLEConnectionStateChange: {"connected":true,"deviceId":"9A48D668-F275-8C7A-6BFE-F14D01B49CAA"}
21:42:39.853  create connection success: {"errMsg":"createBLEConnection:ok"}
21:42:40.899  set notify success: {"errMsg":"notifyBLECharacteristicValueChange:ok"}
21:42:40.919  onBLECharacteristicValueChange:d00ba53030a73030aa3939
21:42:40.940  cmd:d016303461333136346435306164a53535353330
21:42:40.960  cmd:35a7
21:42:40.981  write characteristics success: {"errMsg":"writeBLECharacteristicValue:ok"}
21:42:41.001  onBLECharacteristicValueChange:
21:42:41.042  close connection
21:42:41.063  close connection success: {"errMsg":"closeBLEConnection:ok"}
21:42:41.083  onBLEConnectionStateChange: {"connected":false,"deviceId":"9A48D668-F275-8C7A-6BFE-F14D01B49CAA"}
21:42:41.104  onBLEConnectionStateChange: {"connected":false,"deviceId":"9A48D668-F275-8C7A-6BFE-F14D01B49CAA"}
21:42:41.125  stopBluetoothDiscovery
21:42:41.145  closeBluetoothAdapter
21:42:41.166  onBluetoothAdapterStateChange: {"available":false,"discovering":false}
21:42:41.186  closeBluetoothAdapter success: {"errMsg":"closeBluetoothAdapter:ok"}

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uni-app运行环境说明

App运行环境说明

附件

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