Ble connection latency 25 ms (I've verified that the host device accepts this interval preference)- we're measuring a very high latency (average 80ms). In order to illustrate this concept vividly, reference is made to Figure 5 for explanation. 25ms, 6=7. Sep 18, 2025 · The connection slave latency used before the instant is known as connSlaveLatencyOLD. This page covers the Unicast connection process. The lower the slave latency and faster the connection interval the faster the effective data transfer rate between the peripheral and central. Longer connection intervals save power at the cost of latency. Also, the pref. Usually, the connection interval is a strict tradeoff between power consumption and low latency or delay in communication. Peripheral latency Peripheral latency allows the peripheral to skip waking up for a certain number of connection events if it doesn’t have any data to send. 0 Core Connection Parameters These parameters were part of the original Bluetooth LE specification, and are exchanged during connection establishment. According to the BLE specification, upon connection establishment, the connection interval shall be set to the recommended value (30-50 ms), with 0 slave latency. Sep 24, 2019 · A connection itself is thus a sequence of Connection Events. In this scenario, the peripheral latency mechanism is a perfect solution. The connection interval and slave latency typically affect the performance of a BLE link the most. I am trying to figure out optimal connection parameters so the battery would last as long as possible while the remote would be reasonably responsive (200-250ms latency is fine). And when no further action is pending and TGAP time elapses, the central device checks the Nov 28, 2022 · Learn BLE Connection Management best practices for timing, advertising, and disconnection to build stable, efficient Bluetooth Low Energy device connections. 从这句话可知， slave latency 生效的时刻是通过LL_CONNECTION_UPDATE_IND PDU的intstant参数来约定的。 If we rely solely on the connection interval for adjustments, a lower connection interval would lead to high energy consumption, while a higher connection interval would result in high latency. 5ms) #define DEFAULT_DESIRED_MIN_CONN_INTERVAL 6 //最小连接间隔 Sep 4, 2020 · The Bluetooth Core Specification states: > Slave latency allows a slave to use a reduced number of connection events. Mar 5, 2025 · The problem: even though the connection interval is 6 * 1. May 20, 2025 · Chapter 68: BLE Performance Optimization Chapter Objectives By the end of this chapter, you will be able to: Understand the key metrics for BLE performance: throughput and latency. Connection Interval Time between consecutive connection events How and When Connection Parameters are Set Connection parameters are initially set when a connection is established between the devices. Connection Intervals can range from 7. Mar 25, 2022 · 蓝牙 BLE连接参数 连接间隔讲解 connection interval Slave latency timeout CH573 CH582 CH579 peripheral通用外设例子讲解四 // Minimum connection interval (units of 1. The BLE technology recommended a wide range of parameter settings for the device discovery mechanism and its proper tuning to balance and optimize the performance for a wide range of applications in context of latency and energy consumption [3]. Learn how to configure Data Length Extension (DLE) to increase payload size According to the BLE specification, upon connection establishment, the connection interval shall be set to T GAP (initial_conn_interval), and the recommended value is 30 to 50 ms, with 0 slave latency. The connection slave latency contained in the LL_CONNECTION_UPDATE_IND PDU and used at the instant and after, is known as connSlaveLatencyNEW. > The connSlaveLatency parameter defines the number of consecutive > connection events that the slave device is not required to listen for the master. Connection Interval - The time between each Connection Event. 5ms. Identify the BLE protocol parameters that significantly impact performance, such as Connection Interval, ATT MTU, and PHY layer. In most situations, the phone functions as a BLE central and your widget is a BLE peripheral. 8. Currently, I'm seeing surprisingly large latency numbers from server to client. While optimizing throughput in Sep 26, 2017 · Using the correct Bluetooth LE Advertising and Connection Parameters for a stable connection Q: What advertising and connection parameters should I use in my Bluetooth LE accessory for a successful and stable connection with an Apple product? A: Using incorrect advertising and connection parameters on a BLE accessory is a common source of issues, causing apps to not be able to discover . Here's the distribution of latency for just over a hundred transmissions (with tweaked connection params, see below): BLE Latency The lower end is pretty reasonable and I wouldn't be upset if I was able Apr 6, 2025 · 04 - BLE Connection Parameters Author: Tony Fu Date: 2025/4/6 Device: nRF52840 Dongle Toolchain: nRF Connect SDK v2. Mar 30, 2020 · Latency: used to set the connSlaveLatency (= Latency) which allows the Slave/Peripheral to skip a number of connection events to conserve power and stay at sleep longer: connSlaveLatency=0 –> the Slave is not allowed to skip any connection events. BLE supports both Unicast (Peer-Peer) as well as Broadcast connections. 5ms to 4s. 1. The latency of a BLE connection is mainly determined by the connection interval, which has a minimum value of 7. They define the timing and reliability of the connection. I have a project using NimBLE, and I'm trying to understand limitations / best-case / how to improve BLE latency. connSlaveLatency=n –> the Slave is allowed to skip n connection events. timeout is set to 100ms - we noticed the connection drop a few times- this means that latency is spiking to more than 100ms sometimes! Nov 10, 2023 · The BLE Connection process is usually preceded by a Discovery process, so the devices are aware of each other's presence. Bluetooth Baseband / Radio Slave Latency is the number of BLE connection intervals the slave can sleep in before the connection is terminated. The Connection Interval can be negotiated once the two devices are connected. ipc bjekt wauro zpojv iovlwux tdav kmmaf bjpg pfav auduckf btmavh kildl oiap mww djber