101 lines
2.8 KiB
C++
101 lines
2.8 KiB
C++
/*
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* Copyright (C) 2013 Florian Echtler <floe@butterbrot.org>
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* Eddystone part Copyright (c) 2018 Pavel Brychta <pablo@xpablo.cz>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 3 as published by the Free Software Foundation.
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*/
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#ifndef _BTLE_H_
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#define _BTLE_H_
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#include "Arduino.h"
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#include <RF24.h>
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// float as used on the nRF8001 and nRF51822 platforms
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// and on the "nRF Master Control Panel" and "nRF Temp 2.0" apps.
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// This float representation has the first 8 bits as a base-10 exponent
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// and the last 24 bits as the mantissa.
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typedef int32_t nRF_Float;
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// Service UUIDs used on the nRF8001 and nRF51822 platforms
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#define NRF_TEMPERATURE_SERVICE_UUID 0x1809
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#define NRF_BATTERY_SERVICE_UUID 0x180F
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#define NRF_DEVICE_INFORMATION_SERVICE_UUID 0x180A
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// helper struct for sending temperature as BT service data
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struct nrf_service_data {
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int16_t service_uuid;
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nRF_Float value;
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};
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// advertisement PDU
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struct btle_adv_pdu {
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// packet header
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uint8_t pdu_type; // PDU type
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uint8_t pl_size; // payload size
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// MAC address
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uint8_t mac[6];
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// payload (including 3 bytes for CRC)
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uint8_t payload[24];
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};
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// payload chunk in advertisement PDU payload
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struct btle_pdu_chunk {
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uint8_t size;
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uint8_t type;
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uint8_t data[];
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};
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// helper macro to access chunk at specific offset
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#define chunk(x,y) ((btle_pdu_chunk*)(x.payload+y))
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class BTLE {
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public:
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BTLE( RF24* _radio );
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// convert an arduino float to a nRF_Float
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static nRF_Float to_nRF_Float(float t);
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void begin( const char* _name ); // set BTLE-compatible radio parameters & name
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void setChannel( uint8_t num ); // set the current channel (from 36 to 38)
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void hopChannel(); // hop to the next channel
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// Broadcast an advertisement packet with a specific data type
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// Standardized data types can be seen here:
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// https://www.bluetooth.org/en-us/specification/assigned-numbers/generic-access-profile
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bool advertise( uint8_t data_type, void* buf, uint8_t len );
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// Broadcast an advertisement packet with optional payload
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// Data type will be 0xFF (Manufacturer Specific Data)
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bool advertise( void* buf, uint8_t len );
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bool listen( int timeout = 100 ); // listen for advertisement packets (if true: result = buffer)
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// Broadcast an Eddystone URL packet
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bool eddystoneURL(const char *url);
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btle_adv_pdu buffer; // buffer for received BTLE packet (also used for outgoing!)
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private:
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void whiten( uint8_t len );
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void swapbuf( uint8_t len );
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void crc( uint8_t len, uint8_t* dst );
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uint8_t encodeURL(uint8_t* encodedUrl, const char *rawUrl);
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RF24* radio; // pointer to the RF24 object managing the radio
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uint8_t current; // current channel index
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const char* name; // name of local device
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};
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#endif // _BTLE_H_
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