RNode_Firmware/Bluetooth.h

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// Copyright (C) 2023, Mark Qvist
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
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#include "BluetoothSerial.h"
#include "esp_bt_main.h"
#include "esp_bt_device.h"
BluetoothSerial SerialBT;
#define BT_PAIRING_TIMEOUT 35000
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uint32_t bt_pairing_started = 0;
#define BT_DEV_ADDR_LEN 6
#define BT_DEV_HASH_LEN 16
uint8_t dev_bt_mac[BT_DEV_ADDR_LEN];
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char bt_da[BT_DEV_ADDR_LEN];
char bt_dh[BT_DEV_HASH_LEN];
char bt_devname[11];
#if MCU_VARIANT == MCU_ESP32
void bt_confirm_pairing(uint32_t numVal) {
bt_ssp_pin = numVal;
kiss_indicate_btpin();
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if (bt_allow_pairing) {
SerialBT.confirmReply(true);
} else {
SerialBT.confirmReply(false);
}
}
void bt_stop() {
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if (bt_state != BT_STATE_OFF) {
SerialBT.end();
bt_allow_pairing = false;
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bt_state = BT_STATE_OFF;
}
}
void bt_start() {
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if (bt_state == BT_STATE_OFF) {
SerialBT.begin(bt_devname);
bt_state = BT_STATE_ON;
}
}
void bt_enable_pairing() {
if (bt_state == BT_STATE_OFF) bt_start();
bt_allow_pairing = true;
bt_pairing_started = millis();
bt_state = BT_STATE_PAIRING;
}
void bt_disable_pairing() {
bt_allow_pairing = false;
bt_ssp_pin = 0;
bt_state = BT_STATE_ON;
}
void bt_pairing_complete(boolean success) {
if (success) {
bt_disable_pairing();
} else {
bt_ssp_pin = 0;
}
}
void bt_connection_callback(esp_spp_cb_event_t event, esp_spp_cb_param_t *param){
if(event == ESP_SPP_SRV_OPEN_EVT) {
bt_state = BT_STATE_CONNECTED;
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cable_state = CABLE_STATE_DISCONNECTED;
}
if(event == ESP_SPP_CLOSE_EVT ){
bt_state = BT_STATE_ON;
}
}
bool bt_setup_hw() {
if (!bt_ready) {
if (EEPROM.read(eeprom_addr(ADDR_CONF_BT)) == BT_ENABLE_BYTE) {
bt_enabled = true;
} else {
bt_enabled = false;
}
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if (btStart()) {
if (esp_bluedroid_init() == ESP_OK) {
if (esp_bluedroid_enable() == ESP_OK) {
const uint8_t* bda_ptr = esp_bt_dev_get_address();
char *data = (char*)malloc(BT_DEV_ADDR_LEN+1);
for (int i = 0; i < BT_DEV_ADDR_LEN; i++) {
data[i] = bda_ptr[i];
}
data[BT_DEV_ADDR_LEN] = EEPROM.read(eeprom_addr(ADDR_SIGNATURE));
unsigned char *hash = MD5::make_hash(data, BT_DEV_ADDR_LEN);
memcpy(bt_dh, hash, BT_DEV_HASH_LEN);
sprintf(bt_devname, "RNode %02X%02X", bt_dh[14], bt_dh[15]);
free(data);
SerialBT.enableSSP();
SerialBT.onConfirmRequest(bt_confirm_pairing);
SerialBT.onAuthComplete(bt_pairing_complete);
SerialBT.register_callback(bt_connection_callback);
bt_ready = true;
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return true;
} else { return false; }
} else { return false; }
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} else { return false; }
}
}
bool bt_init() {
bt_state = BT_STATE_OFF;
if (bt_setup_hw()) {
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if (bt_enabled && !console_active) bt_start();
return true;
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} else {
return false;
}
}
void update_bt() {
if (bt_allow_pairing && millis()-bt_pairing_started >= BT_PAIRING_TIMEOUT) {
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bt_disable_pairing();
}
}
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#endif