Esp32 ble multiple connections. You can also have simultaneous ble and classic devices connected, I have ran with at least 10 in total, but not tried max, ie. What is meant by that is that a BLE peripheral can only be connected to one central device (a mobile phone, etc. Mar 16, 2022 · I have been working on a BLE project where two ESP32-WROOM-32 connected to BNO055 9DOF sensors send data to a ESP32 client. This library comes installed by default when you install the ESP32 on the Arduino IDE. Check out Part 1 on Fundamentals of BLE: https://www. Your smartphone or computer acts as the BLE Controller, managing the connection and communication with the ESP32. Jun 11, 2024 · I have other configurations to do in the app, but I came to the conclusion that before continuing to implement features I need to ensure that it is possible to make multiple BLE connections on the same main screen of the app, or even to successfully connect with the ESP32-C3 Super Mini or Zero with any UUIDs written, this being the immediate need for me to continue with this project. Post by hyu7000 » Fri Nov 11, 2022 6:05 am . h" 7. 3. 2 Call the function ble_conn_state_init()to initialize the Connection State Library. If you wish to connect more devices, use additional ESP32 boards. Jun 24, 2022 · I'm trying to find out if it's possible for at least two ESP32's to maintain active BLE connections with one Android mobile device at the same time. Testing ESP32 BLE Server with an Android App. Each service can have one or more characteristics and has its own unique numeric identifier, or UUID, which is either 16 bits (for officially adopted BLE Services) or 128 bits (for custom services). Also, the operation of BLE in iOS and Android is different, so we need to pay attention when implementing it. I currently am able to connect to each one individually and turn the lights on and off. I have a couple questions about BLE. Timeout should be a multiple of the Apr 1, 2024 · It contains the ESP-WROOM-32 as the main module and also some additional hardware to easily program ESP32 and make connections with the GPIO Pins. In order to view this documentation, you must log in first. So far, I have been able to get a one to one connection between one server and the client. I am using couple of nrf52832 devices as the nus peripherial. You switched accounts on another tab or window. I want to connect 2 peripheral devices with my board. Everything works like expected, but if one device is losing the connection (remove it from transmit range or turn it off), the other device will also lose its connection! Apr 11, 2020 · Espressif ESP32 Official Forum. Although the ESP32 is theoretically capable of supporting 6 simultaneous connections, for some reason things break when the client is connected during the connection to the peripherals, but work fine if the client is disconnected before connection to the peripherals Mar 11, 2024 · I am using ESP32-IDF BLE with NimBLE stack. conn_multiple. May 27, 2020 · Remember to connect your ESP32 device with USB to your computer. The objective of the code is to enable the ESP32 to function as a BLE device, allowing it to establish a connection with the target system. Sep 8, 2023 · To build and flash the program of BLE(Bluetooth Low Energy) to ESP32 use the following commands: idf. The way I tried to connect the second Slave was by adding another BluetoothSerial stream for Slave 2. The detail instruction, code, wiring diagram, video tutorial, line-by-line code explanation are provided to help you quickly get started with ESP32. Wrapping Up. EDIT. V… Now we are going to see how we can connect an ESP32 to several mobiles at the same time. What I'm basically trying to do is to send analog sensor data from 2 different sensors to an android app on my phone, at the same time. Aug 25, 2022 · BLE 4. Feb 26, 2024 · I need several users to be able to connect to my server. BLE Server and Client. publish_state("AWAKE"); on Jul 15, 2019 · Espressif ESP32 Official Forum. Our application requires us to send sensor data to 5 smartphones simultaneously, which requires us to be simultaneously connected with 5 BLE centrals while running the ESP32 as a peripheral. Windows is somehow preventing successful BLE connectivity. ESP8266EX and ESP32 are some of our products. They all have unique addresses, but have the same name "hzt" and they use the same Service and Characteristic UUID. To follow this example, you need two ESP32 development boards. This is a cheap card ($ 5) with the dimensions and shape of the Arduino UNO, but with the ESP32. Nov 11, 2021 · Learn how to make a BLE (Bluetooth Low Energy) connection between two ESP32 boards. If the deployment succeed, the following message will be appeared. I'll use the codes of Neil Kolban. BLE represents a paradigm shift in wireless Sep 5, 2019 · Hi! I'm trying to connect my ESP32 to two BLE servers simultaneously (two BLE beacons like iTag, Gigaset Keeper/G-Tag etc). In this blog, I would share how to create the multiple role concurrently example on nRF5 SDK. The ESP32 can act as a BLE server or as a BLE client. For the overview of the ESP32 Bluetooth stack architecture, follow the links below: ESP32 Bluetooth Architecture (PDF) Code examples for this API section are provided in the bluetooth/bluedroid directory of ESP-IDF examples. It is worth noting that I have also implemented battery level characteristics into the Dec 26, 2023 · Communication between multiple ESP32. There are several BLE examples for the ESP32 in the ESP32 BLE library for Arduino IDE. After connection is success, server turns on led. The client operates in two modes: scanning and connected, while the server has two modes: advertising and connected. Search images: D1 R32 ESP32 This card has classic Bluetooth, BLE, WiFi, ADC, DAC, and more feature. Jun 23, 2018 · If you have an ESP32 development board with LoRa built-in, you can skip this step. This component supports devices that require a 6 digit PIN code for authentication. 1. In this example, we will demonstrate how to set up both WiFi and BLE connections at the same time. With Bluetooth Low Energy, there are two types of devices: the server and the client. In the configuration file, the settings are as follows: CONFIG_BT_GATTC_CONNECT_RETRY_COUNT=3. g. Mar 11, 2024 · I am using ESP32-IDF BLE with NimBLE stack. ’ 3 days ago · Understanding ESP32 BLE Before we dive into the technical aspects, let’s have a brief overview of ESP32 BLE. To assess the BLE connection, you’ll need to pair the ESP32 with your smartphone and have a Bluetooth debugging application installed. Reload to refresh your session. The ESP32 series employs either a Tensilica Xtensa LX6, Xtensa LX7 or a RiscV processor, and both dual-core and single-core variations are available. 2 should support a higher number of connections regardless of its role (central vs peripheral). Services. 0 versions. Thanks. Dec 15, 2023 · In the rapidly evolving landscape of Internet of Things (IoT) and embedded systems, the ESP32 microcontroller has emerged as a cornerstone technology. I need to monitor it on HA and, for this purpose, I’ve implemented anything like this: esp32_ble_tracker: ble_client: - mac_address: 34:94:54:25:26:2e id: ESP32_BLE_Remote on_connect: then: - lambda: |- id(ESP32_text_sensor_name2). h" //#include "BLEScan. Espressif Homepage; Upload the code to your ESP32 board. Here's what I'm using as the client code (on two separate devices): Code: [Select all] [Expand/Collapse] You signed in with another tab or window. Apr 15, 2021 · There should be callbacks(EVT) that you can refer to in your client code in which you would choose to continue scanning or advertising based on whether the client is connecting to the servers or if the servers are connecting to your client and if you've hit your max number of connections. 54mm header pins won’t fit on the transceiver pins. You can use ESP32 BLE either as a BLE server or a client. I am currently using the esp-wrover-E product. The spaces between the connections are shorter than usual. You signed out in another tab or window. I need to connect to multiple BLE servers to one client and able send and receive data from client to all servers at a time. This project is about a BLE secure server that supports multi-client through the static passkey. The ESP32 microcontroller is equipped with a built-in BLE module, making it an ideal choice for developing BLE-enabled IoT devices. All the GATT behaviors succeed, except some connection have a chance to get disconnected, especially transmitting data on all connections. Aug 1, 2021 · I need to put a password for BLE connection of ESP32. Even though this was published by Apple, any device that has BLE enabled can use the iBeacon protocol (No iPhone needed!) After the Bluetooth LE connection is established successfully (sometimes users need to try multiple times to get connected), and proper ESP-BLE-MESH GATT Service is discovered, users can see the IDENTIFY interface button on the screen. There is an IDF example of GATTC connecting to 3 BLE Servers: https://github. Code: Select all case BLE_GAP_EVENT_CONNECT: /* A new connection was established or a connection attempt failed. It lets you scan for and connect to BLE peripherals, read and write characteristics, and handle notifications. after resetting above sdkconfig parameters only connect 3 device to esp32 wrover Log in. Someone answered this thread, and told, what he working in Espressif and making tests with hardware. Nov 24, 2022 · #include "BLEDevice. py. You signed in with another tab or window. Parameters impact BLE power consumption. We’ll use and explain the examples that come with the BLE library. A common row of 2. You can use any BLE app from the AppStore to turn the LED on Jul 19, 2023 · To program the ESP32, I utilized Arduino IDE version 2. Feb 7, 2023 · I am working with ESP32-S3 module on Arduino IDE. ) at a time!" The net of this post is: 1) Does the BLE specification allow multiple concurrent connections into a BLE server from multiple BLE clients? 2) If yes to #1, does the ESP32 BLE stack support this concept? Aug 5, 2024 · Wi-Fi capabilities: the ESP32 can easily connect to a Wi-Fi network to connect to the internet (station mode), or create its own Wi-Fi wireless network (access point mode) so other devices can connect to it—this is essential for IoT and Home Automation projects—you can have multiple devices communicating with each other using their Wi-Fi Aug 26, 2022 · I read on reddit, esp32 can connect 7 classic bt connections and 8 BLE connections at the same time. One ESP32 is going to be the server, and the other ESP32 will be the client. It’s essential to note that ESP32 can function as both a server and a client, and the BLE client can hold connections with multiple servers simultaneously. 8+7 links May 26, 2024 · BLEClient – This library lets you create a BLE client on the ESP32. This video explains if it is possible to have multiple connections in #Bluetoothlowenergy / #BLE. And I tried using release version 4. A maximum of three devices is supported due to limitations in the ESP32 BLE stack. So far, I have been able to do a one to one connection and received the orientation and acceleration data. uint8_t max_connection. It would cover how to do the multiple peripheral role, single central role to connect multiple peripherals, combo example (2 x peripheral role + 2 x central role) concurrently. ESP32 BLE. static BLEUUID charUUID("0000180f-0000-1000-8000-00805f9b34fb"); static boolean doConnect = false; static boolean connected = false; static boolean doScan = false; static Mar 12, 2024 · Using nRF Connect for Testing. Jun 30, 2022 · Is there any proper example that connects multiple BLE servers to ESP-32 BLE client?? Suggests me. I am using ESP32-IDF BLE with NimBLE stack. Bluetooth Low Energy is natively supported by mobile operating systems such as iOS, Android, and Windows Phone, as well as macOS, Linux, Windows 8 & 10. Among the various options available, one of our preferred choices is Nordic’s nRF Connect, accessible for both iOS and Android devices. Try to solve one problem at time, make your server code and use an app "BLE Scanner" on your smartphone to make sure you can connect and see the data you are trying to send, after your server code is working with the BLE Scanner app you can try your client code. Each esp32 does the following: Declare a Service and 2 Characteristics with Notify property; Set the value to characteristics (max 20 bytes in size) Nov 16, 2015 · What is meant by that is that a BLE peripheral can only be connected to one central device (a mobile phone, etc. Unfortunately, nothing is found by the smartphone. I have changed I have an issue with connecting to multiple esp32 ble servers. After reading this post, you will be able to program an ESP32 to be a remote-controllable Smart LED. which methods is suitable Please tell me. iBeacon is a powerful BLE (Bluetooth Low Energy) communication protocol made by Apple that allows for any BLE enabled device to find its location and send information with the user’s permission. Smartphones are the Masters Do you know how I can connect multiple BLE sensors (each with unique MAC addresses) to one client? I am using the ESP32, but I can use nRF52 or Arduino BLE devices if necessary. Oct 23, 2017 · Howdy, in the story, it isn't clear to me what role the ESP32 plays. ESP32 can be used as a BLE server supporting multiple BLE clients to access simultaneously. These settings appear to be safe for 3 clients to connect reliably. To communicate multiple ESP32 devices using the RS485 protocol, you need to choose an RS485 transceiver. And, they can go faster if you have less connections. Renowned for its versatility and advanced features, it finds extensive use in a myriad of applications. Feb 28, 2022 · Hello everyone! I have a programming question. What I want to do with the esp32 is a 1:10 bluetooth connection. Is the ESP32 the server that will service multiple parallel connections from external BLE clients or do you want a single ESP32 client to be able to form multiple parallel connections to external BLE Servers? Android BLE App with Maximum Notification (512 bytes) Multiple connections to ESP32 Gateway BLE - WIFI Two-way data exchange. Now, you will be able to read the “log” by the serial monitor. You can use the same sketch to transfer useful data including sensor readings or even control the output pins of the ESP32 boards through another ESP32 board easily. As the central device I use esp32 that acts as gateway. Thanks for your help. I can successfully connect 2 devices and after the connection I am calling the API for discover services for the first device, and then second device. ) at a time!" The net of this post is: 1) Does the BLE specification allow multiple concurrent connections into a BLE server from multiple BLE clients? 2) If yes to #1, does the ESP32 BLE stack support this concept? Jan 12, 2017 · ESP32 (master + GATTC) connect to 2 ESP32 (slave + GATTS); ESP32 (slave + GATTS) connected by 2 ESP32 (master + GATTC) and BTW I also tried 2 ESP32 connected and each both act as GATTS + GATTC. App sends a value to the two ESP32s through a Slider. Extra. Note that you need to disable discoverable and connect able before you can connect to the 7th bt classic device. . How many devices can ESP32 connect to via Bluetooth? ESP32 can connect to multiple devices simultaneously via Bluetooth. However, another area of the API documentation (The API Guide) notes: max_connection. static BLEUUID serviceUUID("0000180a-0000-1000-8000-00805f9b34fb"); // The characteristic of the remote service we are interested in. Is this an example of multi-connections while ESP32 is running as a central only? Nov 16, 2023 · In our particular example, the ESP32 takes the role of the BLE Peripheral, serving as the device that provides data or services. I am currently working on this project where I have several ESP32 talking to each other over Bleutooth. It includes functions for converting data types, managing UUIDs, and Nov 16, 2015 · What is meant by that is that a BLE peripheral can only be connected to one central device (a mobile phone, etc. You can choose from a wide range of RS485 transceivers available in the market, such as MAX485, SN75176 Aug 15, 2017 · I'm looking for multi-connections while ESP32 is running as a peripheral. I tried connecting multiple servers to client but they are not connecting at a time so I can't able to send data from client to all servers at a time. Jun 13, 2024 · In the above diagram, the ESP32 takes the role of the BLE Peripheral, serving as the device that provides data or services. I don't know how to select connection parameters for multiple connection. This tutorial shows how to setup an ESP32 board to receive data from multiple ESP32 boards via ESP-NOW communication protocol (many-to-one configuration) as shown in the following figure. Mar 2, 2019 · BLE with ESP32. Here's what I'm using as the client code (on two separate devices): Code: [Select all] [Expand/Collapse] May 24, 2022 · I am looking for an advise about selection of the optimal connection parameters. dragon541 asked 6 years ago. Oct 7, 2022 · how to set connection interval in ble. Initially I tried to build a bluetooth connection with the code called LED and also EnhancedAdvertising from the arduino ble libary to have a code base. My problem: When I connect one Master and one Slave the code works, but when I try to connect more then 1 Slave it doesn´t work anymore. ) at a time!" The net of this post is: 1) Does the BLE specification allow multiple concurrent connections into a BLE server from multiple BLE clients? 2) If yes to #1, does the ESP32 BLE stack support this concept? 7. As an example, we sent a small packet of data from one ESP32 board to multiple ESP32 boards without using any WiFi or internet connection. Apr 10, 2018 · only able to connect up to four device to single esp32 wrover I change sdkconfig "CONFIG_BTDM_CONTROLLER_BLE_MAX_CONN" = 9 as well "CONFIG_BTDM_CONTROLLER_BLE_MAX_CONN__EFF" = 9 and also changed "CONFIG_BT_ACL_CONNECTIONS" = 7. Tutorial and explanation: I would like to use an ESP32 to connect to 3 BLE LED controllers. through exponential back-off if the device connection is lost; Handle connections to multiple devices simultaneously For the overview of the ESP32 Bluetooth stack architecture, follow the links below: ESP32 Bluetooth Architecture (PDF) Code examples for this API section are provided in the bluetooth/bluedroid directory of ESP-IDF examples. You do have notification service running on server, but your client isn't interested. Mar 16, 2022 · I have been working on connecting one BLE client ESP32 to two ESP32 servers connected to BNO055 9DOF sensors. You can use the same sketch to transfer useful data including sensor readings or even control the output pins of the ESP32 board through other ESP32 boards easily. Please tell me which example is suitable for my Application. You may want to change the maximum allowed number of connections in bluetooth stack. BLE 4. py build idf. This data can include sensor readings, commands, or any information relevant to your application. Sep 29, 2022 · To my understanding, You want the client to connect to the server with given advertised name. After you have got your hands on one, open the Play Store and search for ‘nRF Connect for Mobile. In Part 1 first some BLE basics are discussed and then focuses on the BLE Server This tutorial will guide you through the process of setting up BLE in ESP32 using the Arduino IDE software and demonstrate how to read data on ESP32 via BLE connection and connect two ESP32 devices using BLE. Meanwhile, it can also be used as a BLE client connecting to multiple BLE servers simultaneously. com. Espressif ESP32 Official Forum. Layout We will see what a typical ESP32 Development Board consists of by taking a look at the layout of one of the popular low-cost ESP Boards available in the market called the ESP32 DevKit Board. Namely, I need to create a password as an array, and every time I need to connect my phone I will enter it. The BLE server advertises characteristics that contain sensor readings that the client can read. If max_connection > 10, soft-AP defaults the value to 10. If you have not created an account yet, then please sign up first. but don't connect more than 4 device. io Arduino framework Flash Frequency: 40Mhz Upload Speed: 115200 Description: Using @nkolban BLE server example, I created successful a BLE s Jan 12, 2017 · ESP32 (master + GATTC) connect to 2 ESP32 (slave + GATTS); ESP32 (slave + GATTS) connected by 2 ESP32 (master + GATTC) and BTW I also tried 2 ESP32 connected and each both act as GATTS + GATTC. Aug 17, 2023 · The code works so far, but I can only connect one smartphone to the ESP32, as soon as it is connected, the ESP32 is no longer visible to other smartphones - only when I disconnect the first smartphone, the ESP32 is visible again and another smartphone can reconnect. Apr 7, 2022 · Zephyr is built with BLE in mind and provides excellent APIs. h" // The remote service we wish to connect to. ESP32_GENERIC for example, change CONFIG_BT_NIMBLE_MAX_CONNECTIONS and CONFIG_BTDM_CTRL_BLE_MAX_CONN in config file (default to 4 and 3, respectively). Notify. py flash monitor BLE Data Exchange. Don’t forget the select the board you’re using in Tools > Board and select the COM port your board is connected to in Tools > Port. I am getting the services and characteristics of both devices mixed up not one after the another. 0 Vote Up Vote Down. 4. 8 for ble and 7 for bt classic. 2 and Bluetooth 5. However, the number of devices it can connect to depends on the available memory and processing power of the microcontroller. Nov 22, 2022 · Hi. CONFIG_BT_ACL_CONNECTIONS=4. com/espressif/esp-idf/tree/master/examples/bluetooth/bluedroid/ble/gattc_multi_connect. youtube May 27, 2021 · Goal. A GATT service is a collection of conceptually related data called characteristics. The maximum payload is Apr 23, 2024 · The ESP32 board definitions and tools installed in the Arduino IDE; Introduction. We will need a phone which supports BLE connection. When used as a BLE server, you can simply enable advertising again after a client connects. Of course I also used the recommended apps for ble (nRF Connect or Lightblue). #include "ble_conn_state. I’ve multiple ESP32 boards that are in deep sleep mode for the most of the time and only for few seconds for minute are awake. Jan 7, 2020 · Hello friends, I'll write in this topic about BLE on ESP32, send and receive text, with clock and without clock. Would anyone have any suggestions as to how I can get the client to allow for two connections? Characteristic write capabilities e. 2 and Master version of esp-idf released on github. Let us together review the basics of BLE and then dive into the Zephyr APIs! We will start by implementing a peripheral. Like Nov 29, 2023 · Hey, I bought an arduino nano esp32 to get started and am currently trying ble programming. - Board D1 R32 ESP32. Dec 22, 2017 · Hardware: Board: ESP32 Dev Module Core Installation/update date: 22/dec/2017 IDE name: Platform. Aug 15, 2017 · I'm looking for multi-connections while ESP32 is running as a peripheral. It supports both the central and peripheral roles, allowing it to connect to other BLE devices or act Dec 24, 2020 · <esp32 bluetooth 5. Apr 16, 2020 · Open a serial communication for each of your boards and check that they are receiving the messages. Currently, ESP32 Wi-Fi supports up to 10 Wi-Fi connections. [esp32_ble25] - Code for ESP32 with BLE1: // Juan A. It collects data from NRF peripherial devices. Once the connection is established, the ESP32 BLE Client first reads the characteristic value from the server (we set this as ‘Hello, World!’ in the Server’s code) and prints it on the terminal. Apr 24, 2020 · ESP-NOW with ESP32: Send Data to Multiple Boards (one-to-many) Project Overview. 0 & multiple bluetooth connection> Hello. Among its many capabilities, one that stands out is Bluetooth Low Energy (BLE) connectivity. 0. Jul 24, 2023 · NimBLE supports connection parameters from the BLE standard. Uploading the code Nov 18, 2021 · BLE is used extensively in healthcare, fitness, tracking, beacons, security, and home automation etc. Return to “ESP-IDF”. Max number of stations allowed to connect in, default 4, max 4. Q&A Forum › Category: ESP32 › Multiple BLE Client Connections. May 24, 2022 · I am looking for an advise about selection of the optimal connection parameters. Jun 11, 2024 · For a brief introduction to the ESP32 with BLE on the Arduino IDE, we’ll create an ESP32 BLE server, and then an ESP32 BLE scanner to find that server. 1 post • Page 1 of 1. The three devices sending the data and this one need to read that three devices sending data. ESP32 is a series of low cost, low power system on a chip microcontrollers with integrated Wi-Fi and dual-mode Bluetooth. I set initial connection parameters to 15ms interval, 0 latency, and 120ms timout. ble_conn_state_init(); After this point, we can use the rich set of user-friendly functions offered by the Connection State Library to manage simultaneous connections. This card can be What is meant by that is that a BLE peripheral can only be connected to one central device (a mobile phone, etc. Kindly mention in which API I need to send the data and which API I need to read the data. The maximum payload is As an example, we sent a small packet of data from multiple ESP32 boards to one ESP32 board without using any Wi-Fi or internet connection. Mar 10, 2024 · I am using ESP32-IDF BLE with NimBLE stack. Oct 26, 2021 · Another ESP32 with BLE generates (at random times) two random numbers temperatureBLE2 and humidityBLE2, and notifies them to the application. The ESP32-S3 is a powerful microcontroller from Espressif Systems, capable of running multiple communication protocols simultaneously. Apr 27, 2023 · ESP32 supports Bluetooth 4. After uploading the code to the ESP32, open the Serial Monitor at a baud rate of 9600. Jan 29, 2023 · This tutorial explains how to use Bluetooth Low Energy (BLE) with the ESP32. Once your ESP32 is set up as a BLE server, other BLE devices can connect to it and exchange data. The IDENTIFY operation can be used to tell users which device is going to be provisioned. ) at a time!" The net of this post is: 1) Does the BLE specification allow multiple concurrent connections into a BLE server from multiple BLE clients? 2) If yes to #1, does the ESP32 BLE stack support this concept? Apr 1, 2024 · What this means is that the Client ESP32 scans for BLE devices and if the BLE with the particular UUIDs is found, then it makes a connection. Based on the codes of voltmeter and heart rate monitor, an example is shown. BLEUtils – The BLEUtils library provides utility functions for working with BLE on the ESP32. Learn communication between two ESP32 via WiFi, how to connect two ESP32 via Internet, how to connect two ESP32 wired or wireless, how to control LED on an ESP32 by a button in other ESP32. The idea is that the ESP32 will connect to several temperature sensors and accelerometer/motion sensors and collect/log the incoming data. In this tutorial, you’ve learned how to send data to multiple ESP32 or ESP8266 boards from a single ESP32 using ESP-NOW (one-to-many communication). I have done this at work, so it works. Press the ESP32 on-board RST button. Is this an example of multi-connections while ESP32 is running as a central only? Nov 16, 2023 · The issue turned out to be the BLE client which was connected to the ESP32 while it attempted to connect to the peripherals. To perform this testing functionality of the ESP32 BLE server, we will first test it on a cell phone. to trigger functionality, to update RTC on connect; Ability to attempt re-connects e. The RS485 transceiver is a critical component that converts the UART signal to the RS485 protocol. CONFIG_BT_MULTI_CONNECTION_ENBALE=y. Here's what I'm using as the client code (on two separate devices): Code: [Select all] [Expand/Collapse] Apr 21, 2023 · Hi, I would like connect three esp32 devices to one esp32 device. Find this and other ESP32 tutorials on esp32io. 1 Include the header file of the Connection State Library. With Web BLE, you can create web applications that interact with your ESP32 devices via Bluetooth, enabling you to control GPIO pins, exchange data, and manage your devices remotely through a web interface (this means any device that supports a web browser like your computer or smartphone). 8. The RFM95 transceiver isn’t breadboard friendly. So, join us as we unlock the endless possibilities of ESP32 BLE on the Arduino IDE. A system where ESP32 becomes a BLE server, iOS and Android become a client, and receive data from the server if they have a correct pin code. wymjjhgngrdggolafuwtqmoqvchxkcgodnrnccyfireflswji