[nano33ble] Multiple Concurrent Connections · Issue #108 - GitHub

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[nano33ble] Multiple concurrent connections #108New issueCopy linkNew issueCopy linkOpenOpen[nano33ble] Multiple concurrent connections#108Copy linkLabelshelp wantedAssistance from the community is especially welcomeAssistance from the community is especially welcometype: imperfectionPerceived defect in any part of projectPerceived defect in any part of project

Description

polldoopened on Aug 17, 2020Issue body actions

ArduinoBLE library supports up to ATT_MAX_PEERS multiple concurrent connections.

ArduinoBLE/src/utility/ATT.h

Lines 29 to 35 in 8a49b8c

#if defined(ARDUINO_PORTENTA_H7_M4) || defined(ARDUINO_PORTENTA_H7_M7)

#define ATT_MAX_PEERS 7

#elif DM_CONN_MAX

#define ATT_MAX_PEERS DM_CONN_MAX // Mbed + Cordio

#else

#define ATT_MAX_PEERS 3

#endif

However, using the latest versions of the nano33ble core there are problems when trying to handle multiple connections.

• With version 1.1.3 of the core arduino/ArduinoCore-nRF528x-mbedos@67ef327 the board does not present any problems.
• With version 1.1.4 arduino/ArduinoCore-nRF528x-mbedos@f4ddc96 and following, if the nano33ble board works as a central device, then it cannot connect to multiple peripherals. On the other hand, if it works as a peripheral device, then it is able to handle multiple central devices connected to it.

SETUP: ArduinoBLE version: 1.1.3-10-g89fd740 89fd740 , in branch 'multi-connection' https://github.com/arduino-libraries/ArduinoBLE/tree/multi-connection

Test sketches

• Central, connecting to more peripherals:

#include <ArduinoBLE.h> void setup() { Serial.begin(115200); while(!Serial); BLE.begin(); BLE.debug(Serial); BLE.scanForName("peripheral"); } void connectionLoop() { // If not already connected to 2 peripherals, try to connect to a new found peripheral. if (BLE.peripheralCount() < 2) { BLEDevice peripheral = BLE.available(); if (peripheral) { BLE.stopScan(); if (!peripheral.connect()) { Serial.println("Failed to connect!"); return; } if (!peripheral.discoverAttributes()) { Serial.println("Attribute discovery failed!"); peripheral.disconnect(); return; } } } } auto timeRef = millis(); void loop() { connectionLoop(); if (millis() - timeRef >= 5000) { timeRef = millis(); int periphCount = BLE.peripheralCount(); Serial.print(" Peripheral connected: "); Serial.println(periphCount); if (periphCount < 2) { BLE.scanForName("peripheral"); } // Loop through all connected peripherals for (int periphIdx = 0; periphIdx < periphCount; periphIdx++) { BLEDevice peripheral = BLE.peripheral(periphIdx); if (peripheral) { BLECharacteristic batteryLevelChar = peripheral.characteristic("2A19"); if (!batteryLevelChar) { Serial.println("Peripheral does not have battery level characteristic!"); peripheral.disconnect(); } else { Serial.print("Peripheral connected, value: "); batteryLevelChar.read(); Serial.println(*batteryLevelChar.value()); } } } } }

• Peripherals:

#include <ArduinoBLE.h> BLEService batteryService("180F"); BLEUnsignedCharCharacteristic batteryLevelChar("2A19", BLERead | BLEWrite); void setup() { Serial.begin(115200); pinMode(LED_BUILTIN, OUTPUT); if (!BLE.begin()) { Serial.println("starting BLE failed!"); while (1); } // Configure peripheral BLE.setLocalName("peripheral"); BLE.setAdvertisedService(batteryService); batteryService.addCharacteristic(batteryLevelChar); BLE.addService(batteryService); BLE.advertise(); Serial.println("peripheral configured - central connected: 0"); } auto timeRef = millis(); void loop() { static uint8_t battery = 0; BLE.poll(); if (millis() - timeRef >= 3000) { timeRef = millis(); if (BLE.centralCount() > 0) { digitalWrite(LED_BUILTIN, HIGH); batteryLevelChar.writeValue(battery); battery++; } else { digitalWrite(LED_BUILTIN, LOW); } } }

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