mtu

Request MTU is not working in Nougat

由 纵饮孤独 提交于 2021-01-04 14:36:40
问题 I am working on App which is communicate with BLE device.I can write 20 bytes easily on characteristics but when it is more than 20 bytes it's create problem.I am using mBluetoothGatt.requestMtu(512); write charateristics after getting success. @Override public void onMtuChanged(BluetoothGatt gatt, int mtu, int status) { super.onMtuChanged(gatt, mtu, status); if (status == BluetoothGatt.GATT_SUCCESS) { System.out.print("Mtu Granted"); // this.supportedMTU = mtu; } } which is working fine in

Request MTU is not working in Nougat

由 ￡可爱￡侵袭症＋ 提交于 2021-01-04 14:36:12
问题 I am working on App which is communicate with BLE device.I can write 20 bytes easily on characteristics but when it is more than 20 bytes it's create problem.I am using mBluetoothGatt.requestMtu(512); write charateristics after getting success. @Override public void onMtuChanged(BluetoothGatt gatt, int mtu, int status) { super.onMtuChanged(gatt, mtu, status); if (status == BluetoothGatt.GATT_SUCCESS) { System.out.print("Mtu Granted"); // this.supportedMTU = mtu; } } which is working fine in

Can UDP packet be fragmented to several smaller ones [duplicate]

由 邮差的信 提交于 2020-12-08 07:08:06
问题 This question already has answers here : The most reliable and efficient udp packet size? (4 answers) Closed 8 months ago . Can UDP packet be fragmented to several smaller ones if it exceeds MTU? It seems that MTU fragmentation is about IP layer so I think it can. If so, what is the recommended max. packet size to send over UDP to avoid fragmentation and why? 回答1: Any IP datagram can be fragmented if it is larger than the MTU. Whether it contains UDP, TCP, ICMP, etc. does not matter. Most

Can UDP packet be fragmented to several smaller ones [duplicate]

由 本秂侑毒 提交于 2020-12-08 07:05:57
问题 This question already has answers here : The most reliable and efficient udp packet size? (4 answers) Closed 8 months ago . Can UDP packet be fragmented to several smaller ones if it exceeds MTU? It seems that MTU fragmentation is about IP layer so I think it can. If so, what is the recommended max. packet size to send over UDP to avoid fragmentation and why? 回答1: Any IP datagram can be fragmented if it is larger than the MTU. Whether it contains UDP, TCP, ICMP, etc. does not matter. Most

Tcp面试相关

由 丶灬走出姿态 提交于 2020-04-07 21:26:25
https://mp.weixin.qq.com/s/ZWtXXUtDy7-mHflOFF03iQ 这里总结的很好，补充一下： MTU（Maximum Transmission Unit）最大传输单元，在TCP/IP协议族中，指的是IP数据报能经过一个物理网络的最大报文长度，其中包括了IP首部(从20个字节到60个字节不等)，一般以太网的MTU设为1500字节，加上以太帧首部的长度14字节，也就是一个以太帧不会超过1500+14 = 1514字节。 如上图所示，MTU指的都是一个物理网络之中的。在以太网中，如果上层协议交给IP协议的内容实在是太多，使得一个以太帧超过了1514字节，那么IP报文就必须要分片传输，到达目的主机或目的路由器之后由其重组分片。 MSS MSS（Maximum Segment Size，最大报文段大小，指的是TCP报文（一种IP协议的上层协议）的最大数据报长度，其中不包括TCP首部长度。MSS由TCP链接的过程中由双方协商得出，其中SYN字段中的选项部分包括了这个信息。如果MSS+TCP首部+IP首部大于MTU，那么IP报文就会存在分片，如果小于，那么就可以不需要分片正常发送。 一般来说，MSS = MTU - IP首部大小 - TCP首部大小 MSL是Maximum Segment Lifetime英文的缩写，中文可以译为“报文最大生存时间”
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