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assets/bluetooth_pairing_2.ino
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145
assets/bluetooth_pairing_2.ino
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/**
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* Bluetooth Classic Example
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* Scan for devices - asyncronously, print device as soon as found
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* query devices for SPP - SDP profile
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* connect to first device offering a SPP connection
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*
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* Example python server:
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* source: https://gist.github.com/ukBaz/217875c83c2535d22a16ba38fc8f2a91
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*
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* Tested with Raspberry Pi onboard Wifi/BT, USB BT 4.0 dongles, USB BT 1.1 dongles,
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* 202202: does NOT work with USB BT 2.0 dongles when esp32 aduino lib is compiled with SSP support!
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* see https://github.com/espressif/esp-idf/issues/8394
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*
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* use ESP_SPP_SEC_ENCRYPT|ESP_SPP_SEC_AUTHENTICATE in connect() if remote side requests 'RequireAuthentication': dbus.Boolean(True),
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* use ESP_SPP_SEC_NONE or ESP_SPP_SEC_ENCRYPT|ESP_SPP_SEC_AUTHENTICATE in connect() if remote side has Authentication: False
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*/
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#include <map>
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#include <BluetoothSerial.h>
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#include <M5Core2.h>
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#if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED)
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#error Bluetooth is not enabled! Please run `make menuconfig` to and enable it
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#endif
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#if !defined(CONFIG_BT_SPP_ENABLED)
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#error Serial Bluetooth not available or not enabled. It is only available for the ESP32 chip.
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#endif
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BluetoothSerial SerialBT;
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#define BT_DISCOVER_TIME 10000
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esp_spp_sec_t sec_mask=ESP_SPP_SEC_NONE; // or ESP_SPP_SEC_ENCRYPT|ESP_SPP_SEC_AUTHENTICATE to request pincode confirmation
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esp_spp_role_t role=ESP_SPP_ROLE_SLAVE; // or ESP_SPP_ROLE_MASTER
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// std::map<BTAddress, BTAdvertisedDeviceSet> btDeviceList;
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void setup() {
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M5.begin();
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Serial.begin(115200);
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if(! SerialBT.begin("1Gbps", true) ) {
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Serial.println("========== serialBT failed!");
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abort();
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}
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// SerialBT.setPin("1234"); // doesn't seem to change anything
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// SerialBT.enableSSP(); // doesn't seem to change anything
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Serial.println("Starting discoverAsync...");
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BTScanResults* btDeviceList = SerialBT.getScanResults(); // maybe accessing from different threads!
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if (SerialBT.discoverAsync([](BTAdvertisedDevice* pDevice) {
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// BTAdvertisedDeviceSet*set = reinterpret_cast<BTAdvertisedDeviceSet*>(pDevice);
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// btDeviceList[pDevice->getAddress()] = * set;
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Serial.printf(">>>>>>>>>>>Found a new device asynchronously: %s\n", pDevice->toString().c_str());
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} )
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) {
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delay(BT_DISCOVER_TIME);
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Serial.print("Stopping discoverAsync... ");
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SerialBT.discoverAsyncStop();
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Serial.println("discoverAsync stopped");
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delay(5000);
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if(btDeviceList->getCount() > 0) {
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BTAddress addr;
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int channel=0;
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Serial.println("Found devices:");
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for (int i=0; i < btDeviceList->getCount(); i++) {
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BTAdvertisedDevice *device=btDeviceList->getDevice(i);
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Serial.printf(" ----- %s %s %d\n", device->getAddress().toString().c_str(), device->getName().c_str(), device->getRSSI());
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std::map<int,std::string> channels=SerialBT.getChannels(device->getAddress());
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Serial.printf("scanned for services, found %d\n", channels.size());
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for(auto const &entry : channels) {
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Serial.printf(" channel %d (%s)\n", entry.first, entry.second.c_str());
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}
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if(channels.size() > 0) {
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addr = device->getAddress();
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channel=channels.begin()->first;
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}
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}
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if(addr) {
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Serial.printf("connecting to %s - %d\n", addr.toString().c_str(), channel);
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SerialBT.connect(addr, channel, sec_mask, role);
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}
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} else {
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Serial.println("Didn't find any devices");
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}
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} else {
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Serial.println("Error on discoverAsync f.e. not workin after a \"connect\"");
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}
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}
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String sendData="a";
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void loop() {
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M5.update(); // update button state
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SerialBT.println("a");
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delay(1000);
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SerialBT.println("b");
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delay(100);
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SerialBT.println("c");
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delay(1000);
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if(SerialBT.available()) {
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Serial.print("rx: ");
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while(SerialBT.available()) {
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int c=SerialBT.read();
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if(c >= 0) {
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Serial.print((char) c);
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}
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}
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Serial.println();
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}
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}
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// M5.update();
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// if(M5.BtnA.isPressed()) {
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// sendData="a";
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// }
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// if(M5.BtnB.isPressed()) {
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// sendData="b";
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// }
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// if(M5.BtnC.isPressed()) {
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// sendData="c";
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// }
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// if(! SerialBT.isClosed() && SerialBT.connected()) {
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// // if( SerialBT.write((const uint8_t*) sendData.c_str(),sendData.length()) != sendData.length()) {
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// // Serial.println("tx: error");
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// // } else {
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// // Serial.printf("tx: %s",sendData.c_str());
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// // }
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// // if(SerialBT.available()) {
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// // Serial.print("rx: ");
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// // while(SerialBT.available()) {
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// // int c=SerialBT.read();
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// // if(c >= 0) {
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// // Serial.print((char) c);
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// // }
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// // }
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// // Serial.println();
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// // }
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// } else {
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// Serial.println("not connected");
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// }
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//
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//}
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