[iOS] [BLE]获取协商MTU [英] [iOS][BLE] Get negotiate MTU

问题描述

我目前正在iOS上开发BLE应用程序. 在我的应用程序中，我需要实现一个分段协议以使用BLE发送大数据. 我的应用程序需要扮演中心角色.

I'm currently developing a BLE App in iOS. In my application I need to implement a segmentation protocol to send large datas using BLE. My application need to have the Central role.

我的问题是我无法获得协商的MTU.我可以获得外围设备的maximumWriteValueLength，但它比我的外围设备大，找不到我的中央对象的maximumWriteValueLength.

My issue is that I can't get the negotiate MTU. I can get the maximumWriteValueLength of my peripheral but it is bigger that mine and can't find the maximumWriteValueLength of my central object.

有人知道找到协商MTU的方法还是访问我的CBCentralManager的CBCentral对象的方法吗?

Did someone know a way to find the negotiate MTU or a way to access the CBCentral object of my CBCentralManager?

推荐答案

我将为遇到相同问题的人解答.

I will answer for people with same issue.

现在(2017年2月)，处于外围设备角色的iPhone的MTU始终为158. 因此，我在短期解决方案(只是进行一些测试)中发现的是将中央MTU与158进行比较，然后选择较小的MTU. 对于解决方案，更稳定的外设将在连接后将读取的特定特性内写入MTU大小.

Right now (February 2017) the MTU of iPhone in Peripheral role is always 158. So what I have found in short solution (just to make some test) is to compare the Central MTU to 158 and take the smaller one. For a solution more stable peripheral will write the MTU size inside a specific characteristic that I will read after the connection.

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