BluetoothSerial does not allow discoverAsync if a device was previously paired #9130
Description
Board
TinyPICO
Device Description
Plain TinyPICO with ESP32 PICO chip
Hardware Configuration
No
Version
v2.0.14
IDE Name
Arduino IDE
Operating System
macOS 14.2.1
Flash frequency
80MHz
PSRAM enabled
yes
Upload speed
115200
Description
In BluetoothSerial class the discoverAsync method check is RemoteName or address are set because they are not allowed to be set during discovery.
Unfortunately, there does not seem to be a way to clear those. This means that once a device has been connected, discoverAsync will no longer work and always return false, even after a call to disconnect
There should be a way to reset the class and allow a new discoverAsync cycle to start.
Sketch
#include <map>
#include <BluetoothSerial.h>
#if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED)
#error Bluetooth is not enabled! Please run `make menuconfig` to and enable it
#endif
#if !defined(CONFIG_BT_SPP_ENABLED)
#error Serial Bluetooth not available or not enabled. It is only available for the ESP32 chip.
#endif
BluetoothSerial SerialBT;
#define BT_DISCOVER_TIME 10000
esp_spp_sec_t sec_mask=ESP_SPP_SEC_NONE; // or ESP_SPP_SEC_ENCRYPT|ESP_SPP_SEC_AUTHENTICATE to request pincode confirmation
esp_spp_role_t role=ESP_SPP_ROLE_MASTER; // or ESP_SPP_ROLE_MASTER
void discoverAndConnect()
{
Serial.println("Starting discoverAsync...");
BTScanResults* btDeviceList = SerialBT.getScanResults();
if (SerialBT.discoverAsync([](BTAdvertisedDevice* pDevice) {
Serial.printf(">>>>>>>>>>>Found a new device asynchronously: %s\n", pDevice->toString().c_str());
} )
) {
delay(BT_DISCOVER_TIME);
Serial.print("Stopping discoverAsync... ");
SerialBT.discoverAsyncStop();
Serial.println("discoverAsync stopped");
delay(5000);
if(btDeviceList->getCount() > 0) {
BTAddress addr;
int channel=0;
Serial.println("Found devices:");
for (int i=0; i < btDeviceList->getCount(); i++) {
BTAdvertisedDevice *device=btDeviceList->getDevice(i);
Serial.printf(" ----- %s %s %d\n", device->getAddress().toString().c_str(), device->getName().c_str(), device->getRSSI());
std::map<int,std::string> channels=SerialBT.getChannels(device->getAddress());
Serial.printf("scanned for services, found %d\n", channels.size());
for(auto const &entry : channels) {
Serial.printf(" channel %d (%s)\n", entry.first, entry.second.c_str());
}
if(channels.size() > 0) {
addr = device->getAddress();
channel=channels.begin()->first;
}
}
if(addr) {
Serial.printf("connecting to %s - %d\n", addr.toString().c_str(), channel);
SerialBT.connect(addr, channel, sec_mask, role);
}
} else {
Serial.println("Didn't find any devices");
}
} else {
Serial.println("Error on discoverAsync");
}
}
void setup() {
Serial.begin(115200);
if(! SerialBT.begin("ESP32test", true) ) {
Serial.println("========== serialBT failed!");
abort();
}
SerialBT.enableSSP();
discoverAndConnect();
}
void loop() {
if(! SerialBT.isClosed() && SerialBT.connected()) {
Serial.println("Connected");
SerialBT.disconnect();
// This will never succeed
discoverAndConnect();
} else {
Serial.println("Not connected");
}
delay(1000);
}Debug Message
No errors
Other Steps to Reproduce
No response
I have checked existing issues, online documentation and the Troubleshooting Guide
- I confirm I have checked existing issues, online documentation and Troubleshooting guide.