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This article "how to monitor the eigenvalue changes of low-power Bluetooth devices in Mini Program development" is not understood by most people except programmers. Today, in order to make you better understand "how to monitor the eigenvalue changes of low-power Bluetooth devices in Mini Program development", I summarize the following contents, which have a certain reference value, the detailed steps are clear, and the details are handled properly. I hope you can get something from this article. Let's take a look at the details.

Listen for eigenvalue changes of low-power Bluetooth devices. The notify interface must be enabled before you can receive the notification pushed by the device.

CALLBACK parameter description:

Parameter type description: deviceIdString Bluetooth device id. Refer to device object serviceIdString eigenvalue the service uuidcharacteristicIdString eigenvalue the latest eigenvalue of uuidvalueArrayBuffer eigenvalue (Note: vConsole cannot print ArrayBuffer type data)

Sample code:

/ / ArrayBuffer to 16 progress string example function ab2hex (buffer) {var hexArr = Array.prototype.map.call (new Uint8Array (buffer), function (bit) {return ('00' + bit.toString (16). Slice (- 2)}) return hexArr.join ('') } wx.onBLECharacteristicValueChange (function (res) {console.log (`characteristic ${res.characteristicId} has changed, now is ${res.value} `) console.log (ab2hext (res.value)) what does Mini Program mean? Mini Program is an application that can be used without download or installation. It can be used immediately by scanning QR code or searching. It is easy to operate and easy to spread, and can achieve seven major functions, such as message notification, offline code scanning, and official account association. It is based on Wechat, similar to APP. You can use it whenever you want. After using it, you will leave without taking up memory.

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