i-Smarties/BTLE
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Eddystone URL beacon working.

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This commit is contained in:
Pavel Brychta 2018-07-21 10:46:45 +02:00
parent f1502f2d29
commit 448e56a9e0
2 changed files with 65 additions and 5 deletions
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59
BTLE.cpp
View File

@ -286,8 +286,7 @@ void BTLE::crc( uint8_t len, uint8_t* dst ) {
}
}
uint8_t BTLE::encodeURL(uint8_t* encodedUrl, const char *rawUrl)
{
uint8_t BTLE::encodeURL(uint8_t* encodedUrl, const char *rawUrl) {
uint8_t urlDataLength = 0;
/*
@ -334,3 +333,59 @@ uint8_t BTLE::encodeURL(uint8_t* encodedUrl, const char *rawUrl)
}
return urlDataLength;
}
bool BTLE::eddystoneURL(const char *url){
uint8_t encurl[MAX_URL_DATA + 2];
uint8_t pls = 0;
uint8_t urllen = encodeURL(encurl, url);
if (0 == urllen)
return false;
// insert pseudo-random MAC address
buffer.mac[0] = ((__TIME__[6]-0x30) << 4) | (__TIME__[7]-0x30);
buffer.mac[1] = ((__TIME__[3]-0x30) << 4) | (__TIME__[4]-0x30);
buffer.mac[2] = ((__TIME__[0]-0x30) << 4) | (__TIME__[1]-0x30);
buffer.mac[3] = ((__DATE__[4]-0x30) << 4) | (__DATE__[5]-0x30);
buffer.mac[4] = month(__DATE__);
buffer.mac[5] = ((__DATE__[9]-0x30) << 4) | (__DATE__[10]-0x30);
// add device descriptor chunk
chunk(buffer,pls)->size = 0x02; // chunk size: 2
chunk(buffer,pls)->type = 0x01; // chunk type: device flags
chunk(buffer,pls)->data[0]= 0x06; // flags: CSS v5, Part A, paragraph 1.3
pls += 3;
// add eddystone service + frame packet
chunk(buffer, pls)->size = 5 + urllen; // data length
chunk(buffer, pls)->type = 0x16; // data type "Service Data"
chunk(buffer, pls)->data[0] = 0xaa; // Eddystone Service UUID of 0xFEAA
chunk(buffer, pls)->data[1] = 0xfe; // Eddystone Service UUID of 0xFEAA
chunk(buffer, pls)->data[2] = 0x10; // Frame Type: Eddystone-URL
chunk(buffer, pls)->data[3] = 0x00; // TX Power
for (uint8_t i = 0; i < urllen; i++)
chunk(buffer, pls)->data[4 + i] = encurl[i];
pls += 6 + urllen;
// total payload size must be 21 bytes or less
if (pls > 21)
return false;
// assemble header
buffer.pdu_type = 0x42; // PDU type: ADV_NONCONN_IND, TX address is random
buffer.pl_size = pls+6; // set final payload size in header incl. MAC
// calculate CRC over header+MAC+payload, append after payload
uint8_t* outbuf = (uint8_t*)&buffer;
crc( pls+8, outbuf+pls+8);
// whiten header+MAC+payload+CRC, swap bit order
whiten( pls+11 );
swapbuf( pls+11 );
// flush buffers and send
radio->stopListening();
radio->write( outbuf, pls+11 );
return true;
}

5
BTLE.h
View File

@ -1,5 +1,6 @@
/*
* Copyright (C) 2013 Florian Echtler <floe@butterbrot.org>
* Eddystone part Copyright (c) 2018 Pavel Brychta <pablo@xpablo.cz>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
@ -78,6 +79,9 @@ class BTLE {
bool advertise( void* buf, uint8_t len );
bool listen( int timeout = 100 ); // listen for advertisement packets (if true: result = buffer)
// Broadcast an Eddystone URL packet
bool eddystoneURL(const char *url);
btle_adv_pdu buffer; // buffer for received BTLE packet (also used for outgoing!)
private:
@ -85,6 +89,7 @@ class BTLE {
void whiten( uint8_t len );
void swapbuf( uint8_t len );
void crc( uint8_t len, uint8_t* dst );
uint8_t encodeURL(uint8_t* encodedUrl, const char *rawUrl);
RF24* radio; // pointer to the RF24 object managing the radio
uint8_t current; // current channel index