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Support for Master mode, Pin and SSP (#3219)

* 20190916 - initial: support for Master mode, Pin and SSP

* 20190916 - initial: Add example app for Master mode

* 20190916 - initial: Force another build

* 20190916 - connect would use resolved address as preference and remove now redundant _remote_address

* 20190916 - rework set/reset/default pin logic

* 20190916 - cleanup: remove static vars, add/use constants, fix typos

* 20190916 - fix build issues and implement geoup events for status verification.

* 20190916 - remove extra lines,misc

* 20190916 - rework ESP_BT_GAP_DISC_RES_EVT, added SPP_DISCONNECTED bit for disconnect event. + timeout for disconnect()

* 20190916 - Small log change to improve log sequencing

* 20190916 - remove static from local vars

* 20190916 - Limited scope and duration for the scan, log device address during scan in info mode as it is very difficult to find out sometimes. Fixed get_name_from_eir() not resetting the name when called.

* 20190916 - break property for loop during scan when name matches.

* 20190916 - misc

* 20190916 - SPP_DISCONNECT state updates

* 20190916 - formatting, remove some strange syntax from initiator code

* 20190916 - Add comments to the example about connect(...) usage and timeouts

* 20190916 - fix disconnect() without timeout

* 20190916 - Add example comment to view BT address and name during connect(name)

* 20190916 - wording in example comments

* 20190916 - rework connect() and disconnect() methods to help with concurrency and more authoritative status returned back to caller. Automatic disconnect in connect() methods

* 20190916 - optimize code

* 20190916 - optimize code - more

* 20190916 - add timeout for pin set

* 20190916 - change scan mode to ESP_BT_SCAN_MODE_CONNECTABLE_DISCOVERABLE

* 20190916 - update example code slightly

* 20190916 - increase READY_TIMEOUT to 10 secs

* 20190916 - typo in example and move waitForConnect() to static area

* 20190916 - update example comments

* 20190916 - update example comments

* 20190916 - update example comments

* 20190916 - add new example to remove paired devices from ESP32

* 20190916 - correct typo in example

* 20190916 - update example comment, add remove_bond_device() method for convenience.

* 20190916 - reword example comment.

* 20190916 - rename remove_bond_device()

* 20190916 - rename removePairedDevice() to unpairDevice()

* 20190916 - code review changes

* 20190916 - fix return value in setup() od example
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IonicEV authored and me-no-dev committed Oct 1, 2019
1 parent b334b2c commit 38c4c0610846b7193e908b474e2c8db06ae981ba
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//This example code is in the Public Domain (or CC0 licensed, at your option.)
//By Victor Tchistiak - 2019
//
//This example demostrates master mode bluetooth connection and pin
//it creates a bridge between Serial and Classical Bluetooth (SPP)
//this is an extention of the SerialToSerialBT example by Evandro Copercini - 2018
//

#include "BluetoothSerial.h"

BluetoothSerial SerialBT;

String MACadd = "AA:BB:CC:11:22:33";
uint8_t address[6] = {0xAA, 0xBB, 0xCC, 0x11, 0x22, 0x33};
//uint8_t address[6] = {0x00, 0x1D, 0xA5, 0x02, 0xC3, 0x22};
String name = "OBDII";
char *pin = "1234"; //<- standard pin would be provided by default
bool connected;

void setup() {
Serial.begin(115200);
//SerialBT.setPin(pin);
SerialBT.begin("ESP32test", true);
//SerialBT.setPin(pin);
Serial.println("The device started in master mode, make sure remote BT device is on!");

// connect(address) is fast (upto 10 secs max), connect(name) is slow (upto 30 secs max) as it needs
// to resolve name to address first, but it allows to connect to different devices with the same name.
// Set CoreDebugLevel to Info to view devices bluetooth address and device names
connected = SerialBT.connect(name);
//connected = SerialBT.connect(address);

if(connected) {
Serial.println("Connected Succesfully!");
} else {
while(!SerialBT.connected(10000)) {
Serial.println("Failed to connect. Make sure remote device is available and in range, then restart app.");
}
}
// disconnect() may take upto 10 secs max
if (SerialBT.disconnect()) {
Serial.println("Disconnected Succesfully!");
}
// this would reconnect to the name(will use address, if resolved) or address used with connect(name/address).
SerialBT.connect();
}

void loop() {
if (Serial.available()) {
SerialBT.write(Serial.read());
}
if (SerialBT.available()) {
Serial.write(SerialBT.read());
}
delay(20);
}
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//This example code is in the Public Domain (or CC0 licensed, at your option.)
//By Victor Tchistiak - 2019
//
//This example demonstrates reading and removing paired devices stored on the ESP32 flash memory
//Sometimes you may find your ESP32 device could not connect to the remote device despite
//many successful connections earlier. This is most likely a result of client replacing your paired
//device info with new one from other device. The BT clients store connection info for paired devices,
//but it is limited to a few devices only. When new device pairs and number of stored devices is exceeded,
//one of the previously paired devices would be replaced with new one.
//The only remedy is to delete this saved bound device from your device flash memory
//and pair with the other device again.
//
#include "esp_bt_main.h"
#include "esp_bt_device.h"
#include"esp_gap_bt_api.h"
#include "esp_err.h"

#define REMOVE_BONDED_DEVICES 0 // <- Set to 0 to view all bonded devices addresses, set to 1 to remove

#define PAIR_MAX_DEVICES 20
uint8_t pairedDeviceBtAddr[PAIR_MAX_DEVICES][6];
char bda_str[18];

bool initBluetooth()
{
if(!btStart()) {
Serial.println("Failed to initialize controller");
return false;
}

if(esp_bluedroid_init() != ESP_OK) {
Serial.println("Failed to initialize bluedroid");
return false;
}

if(esp_bluedroid_enable() != ESP_OK) {
Serial.println("Failed to enable bluedroid");
return false;
}
return true;
}

char *bda2str(const uint8_t* bda, char *str, size_t size)
{
if (bda == NULL || str == NULL || size < 18) {
return NULL;
}
sprintf(str, "%02x:%02x:%02x:%02x:%02x:%02x",
bda[0], bda[1], bda[2], bda[3], bda[4], bda[5]);
return str;
}

void setup() {
Serial.begin(115200);

initBluetooth();
Serial.print("ESP32 bluetooth address: "); Serial.println(bda2str(esp_bt_dev_get_address(), bda_str, 18));
// Get the numbers of bonded/paired devices in the BT module
int count = esp_bt_gap_get_bond_device_num();
if(!count) {
Serial.println("No bonded device found.");
} else {
Serial.print("Bonded device count: "); Serial.println(count);
if(PAIR_MAX_DEVICES < count) {
count = PAIR_MAX_DEVICES;
Serial.print("Reset bonded device count: "); Serial.println(count);
}
esp_err_t tError = esp_bt_gap_get_bond_device_list(&count, pairedDeviceBtAddr);
if(ESP_OK == tError) {
for(int i = 0; i < count; i++) {
Serial.print("Found bonded device # "); Serial.print(i); Serial.print(" -> ");
Serial.println(bda2str(pairedDeviceBtAddr[i], bda_str, 18));
if(REMOVE_BONDED_DEVICES) {
esp_err_t tError = esp_bt_gap_remove_bond_device(pairedDeviceBtAddr[i]);
if(ESP_OK == tError) {
Serial.print("Removed bonded device # ");
} else {
Serial.print("Failed to remove bonded device # ");
}
Serial.println(i);
}
}
}
}
}

void loop() {}

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