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/*********************************************************************
This is an example for our nRF52 based Bluefruit LE modules
Pick one up today in the adafruit shop!
Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing
products from Adafruit!
MIT license, check LICENSE for more information
All text above, and the splash screen below must be included in
any redistribution
*********************************************************************/
/*
* This sketch demonstrate how to run both Central and Peripheral roles
* at the same time. It will act as a relay between an central (mobile)
* to another peripheral using bleuart service.
*
* Mobile <--> DualRole <--> peripheral Ble Uart
*/
#include <bluefruit.h>
// Peripheral uart service
BLEUart bleuart;
// Central uart client
BLEClientUart clientUart;
void setup()
{
Serial.begin(115200);
while ( !Serial ) delay(10); // for nrf52840 with native usb
Serial.println("Bluefruit52 Dual Role BLEUART Example");
Serial.println("-------------------------------------\n");
// Initialize Bluefruit with max concurrent connections as Peripheral = 1, Central = 1
// SRAM usage required by SoftDevice will increase with number of connections
Bluefruit.begin(1, 1);
// Set max power. Accepted values are: -40, -30, -20, -16, -12, -8, -4, 0, 4
Bluefruit.setTxPower(4);
Bluefruit.setName("Bluefruit52 duo");
// Callbacks for Peripheral
Bluefruit.setConnectCallback(prph_connect_callback);
Bluefruit.setDisconnectCallback(prph_disconnect_callback);
// Callbacks for Central
Bluefruit.Central.setConnectCallback(cent_connect_callback);
Bluefruit.Central.setDisconnectCallback(cent_disconnect_callback);
// Configure and Start BLE Uart Service
bleuart.begin();
bleuart.setRxCallback(prph_bleuart_rx_callback);
// Init BLE Central Uart Serivce
clientUart.begin();
clientUart.setRxCallback(cent_bleuart_rx_callback);
/* Start Central Scanning
* - Enable auto scan if disconnected
* - Interval = 100 ms, window = 80 ms
* - Filter only accept bleuart service
* - Don't use active scan
* - Start(timeout) with timeout = 0 will scan forever (until connected)
*/
Bluefruit.Scanner.setRxCallback(scan_callback);
Bluefruit.Scanner.restartOnDisconnect(true);
Bluefruit.Scanner.setInterval(160, 80); // in unit of 0.625 ms
Bluefruit.Scanner.filterUuid(bleuart.uuid);
Bluefruit.Scanner.useActiveScan(false);
Bluefruit.Scanner.start(0); // 0 = Don't stop scanning after n seconds
// Set up and start advertising
startAdv();
}
void startAdv(void)
{
// Advertising packet
Bluefruit.Advertising.addFlags(BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE);
Bluefruit.Advertising.addTxPower();
// Include bleuart 128-bit uuid
Bluefruit.Advertising.addService(bleuart);
// Secondary Scan Response packet (optional)
// Since there is no room for 'Name' in Advertising packet
Bluefruit.ScanResponse.addName();
/* Start Advertising
* - Enable auto advertising if disconnected
* - Interval: fast mode = 20 ms, slow mode = 152.5 ms
* - Timeout for fast mode is 30 seconds
* - Start(timeout) with timeout = 0 will advertise forever (until connected)
*
* For recommended advertising interval
* https://developer.apple.com/library/content/qa/qa1931/_index.html
*/
Bluefruit.Advertising.restartOnDisconnect(true);
Bluefruit.Advertising.setInterval(32, 244); // in unit of 0.625 ms
Bluefruit.Advertising.setFastTimeout(30); // number of seconds in fast mode
Bluefruit.Advertising.start(0); // 0 = Don't stop advertising after n seconds
}
void loop()
{
// do nothing, all the work is done in callback
}
/*------------------------------------------------------------------*/
/* Peripheral
*------------------------------------------------------------------*/
void prph_connect_callback(uint16_t conn_handle)
{
char peer_name[32] = { 0 };
Bluefruit.Gap.getPeerName(conn_handle, peer_name, sizeof(peer_name));
Serial.print("[Prph] Connected to ");
Serial.println(peer_name);
}
void prph_disconnect_callback(uint16_t conn_handle, uint8_t reason)
{
(void) conn_handle;
(void) reason;
Serial.println();
Serial.println("[Prph] Disconnected");
}
void prph_bleuart_rx_callback(void)
{
// Forward data from Mobile to our peripheral
char str[20+1] = { 0 };
bleuart.read(str, 20);
Serial.print("[Prph] RX: ");
Serial.println(str);
if ( clientUart.discovered() )
{
clientUart.print(str);
}else
{
bleuart.println("[Prph] Central role not connected");
}
}
/*------------------------------------------------------------------*/
/* Central
*------------------------------------------------------------------*/
void scan_callback(ble_gap_evt_adv_report_t* report)
{
// Since we configure the scanner with filterUuid()
// Scan callback only invoked for device with bleuart service advertised
// Connect to the device with bleuart service in advertising packet
Bluefruit.Central.connect(report);
}
void cent_connect_callback(uint16_t conn_handle)
{
char peer_name[32] = { 0 };
Bluefruit.Gap.getPeerName(conn_handle, peer_name, sizeof(peer_name));
Serial.print("[Cent] Connected to ");
Serial.println(peer_name);;
if ( clientUart.discover(conn_handle) )
{
// Enable TXD's notify
clientUart.enableTXD();
}else
{
// disconect since we couldn't find bleuart service
Bluefruit.Central.disconnect(conn_handle);
}
}
void cent_disconnect_callback(uint16_t conn_handle, uint8_t reason)
{
(void) conn_handle;
(void) reason;
Serial.println("[Cent] Disconnected");
}
/**
* Callback invoked when uart received data
* @param cent_uart Reference object to the service where the data
* arrived. In this example it is clientUart
*/
void cent_bleuart_rx_callback(BLEClientUart& cent_uart)
{
char str[20+1] = { 0 };
cent_uart.read(str, 20);
Serial.print("[Cent] RX: ");
Serial.println(str);
if ( bleuart.notifyEnabled() )
{
// Forward data from our peripheral to Mobile
bleuart.print( str );
}else
{
// response with no prph message
clientUart.println("[Cent] Peripheral role not connected");
}
}
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