255 lines
8.1 KiB
C
255 lines
8.1 KiB
C
/*
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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/****************************************************************************
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*
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* This file is used to decode eddystone information.
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*
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****************************************************************************/
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include <stdbool.h>
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#include "esp_err.h"
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#include "esp_gap_ble_api.h"
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#include "esp_eddystone_protocol.h"
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#include "esp_eddystone_api.h"
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/* Declare static functions */
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static esp_err_t esp_eddystone_uid_received(const uint8_t* buf, uint8_t len, esp_eddystone_result_t* res);
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static esp_err_t esp_eddystone_url_received(const uint8_t* buf, uint8_t len, esp_eddystone_result_t* res);
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static char* esp_eddystone_resolve_url_scheme(const uint8_t* url_start, const uint8_t* url_end);
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static esp_err_t esp_eddystone_tlm_received(const uint8_t* buf, uint8_t len, esp_eddystone_result_t* res);
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static esp_err_t esp_eddystone_get_inform(const uint8_t* buf, uint8_t len, esp_eddystone_result_t* res);
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/* Eddystone-URL scheme prefixes */
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static const char* eddystone_url_prefix[4] = {
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"http://www.",
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"https://www.",
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"http://",
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"https://"
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};
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/* Eddystone-URL HTTP URL encoding */
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static const char* eddystone_url_encoding[14] = {
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".com/",
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".org/",
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".edu/",
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".net/",
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".info/",
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".biz/",
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".gov/",
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".com",
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".org",
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".edu",
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".net",
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".info",
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".biz",
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".gov"
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};
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/****************** Eddystone-UID **************
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Byte offset Field Description
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0 Frame Type Value = 0x00
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1 Ranging Data Calibrated Tx power at 0 m
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2 NID[0] 10-byte Namespace
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3 NID[1]
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4 NID[2]
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5 NID[3]
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6 NID[4]
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7 NID[5]
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8 NID[6]
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9 NID[7]
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10 NID[8]
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11 NID[9]
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12 BID[0] 6-byte Instance
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13 BID[1]
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14 BID[2]
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15 BID[3]
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16 BID[4]
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17 BID[5]
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18 RFU Reserved for future use, must be0x00
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19 RFU Reserved for future use, must be0x00
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*********************************************/
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/* decode and store received UID */
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static esp_err_t esp_eddystone_uid_received(const uint8_t* buf, uint8_t len, esp_eddystone_result_t* res)
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{
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uint8_t pos = 0;
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//1-byte Ranging Data + 10-byte Namespace + 6-byte Instance
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if((len != EDDYSTONE_UID_DATA_LEN) && (len != (EDDYSTONE_UID_RFU_LEN+EDDYSTONE_UID_DATA_LEN))) {
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//ERROR:uid len wrong
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return -1;
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}
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res->inform.uid.ranging_data = buf[pos++];
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for(int i=0; i<EDDYSTONE_UID_NAMESPACE_LEN; i++) {
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res->inform.uid.namespace_id[i] = buf[pos++];
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}
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for(int i=0; i<EDDYSTONE_UID_INSTANCE_LEN; i++) {
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res->inform.uid.instance_id[i] = buf[pos++];
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}
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return 0;
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}
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/* resolve received URL to url_res pointer */
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static char* esp_eddystone_resolve_url_scheme(const uint8_t *url_start, const uint8_t *url_end)
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{
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int pos = 0;
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static char url_buf[100] = {0};
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const uint8_t *p = url_start;
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pos += sprintf(&url_buf[pos], "%s", eddystone_url_prefix[*p++]);
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for (; p <= url_end; p++) {
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if (esp_eddystone_is_char_invalid((*p))) {
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pos += sprintf(&url_buf[pos], "%s", eddystone_url_encoding[*p]);
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} else {
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pos += sprintf(&url_buf[pos], "%c", *p);
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}
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}
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return url_buf;
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}
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/************************** Eddystone-URL *************
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Frame Specification
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Byte offset Field Description
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0 Frame Type Value = 0x10
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1 TX Power Calibrated Tx power at 0 m
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2 URL Scheme Encoded Scheme Prefix
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3+ Encoded URL Length 1-17
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*******************************************************/
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/* decode and store received URL, the pointer url_res points to the resolved url */
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static esp_err_t esp_eddystone_url_received(const uint8_t* buf, uint8_t len, esp_eddystone_result_t* res)
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{
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char *url_res = NULL;
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uint8_t pos = 0;
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if(len-EDDYSTONE_URL_TX_POWER_LEN > EDDYSTONE_URL_MAX_LEN) {
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//ERROR:too long url
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return -1;
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}
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res->inform.url.tx_power = buf[pos++];
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url_res = esp_eddystone_resolve_url_scheme(buf+pos, buf+len-1);
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memcpy(&res->inform.url.url, url_res, strlen(url_res));
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res->inform.url.url[strlen(url_res)] = '\0';
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return 0;
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}
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/****************** eddystone-tlm ***************
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* Unencrypted TLM Frame Specification
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Byte offset Field Description
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0 Frame Type Value = 0x20
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1 Version TLM version, value = 0x00
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2 VBATT[0] Battery voltage, 1 mV/bit
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3 VBATT[1]
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4 TEMP[0] Beacon temperature
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5 TEMP[1]
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6 ADV_CNT[0] Advertising PDU count
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7 ADV_CNT[1]
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8 ADV_CNT[2]
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9 ADV_CNT[3]
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10 SEC_CNT[0] Time since power-on or reboot
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11 SEC_CNT[1]
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12 SEC_CNT[2]
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13 SEC_CNT[3]
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************************************************/
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/* decode and store received TLM */
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static esp_err_t esp_eddystone_tlm_received(const uint8_t* buf, uint8_t len, esp_eddystone_result_t* res)
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{
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uint8_t pos = 0;
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if(len > EDDYSTONE_TLM_DATA_LEN) {
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//ERROR:TLM too long
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return -1;
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}
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res->inform.tlm.version = buf[pos++];
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res->inform.tlm.battery_voltage = big_endian_read_16(buf, pos);
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pos += 2;
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uint16_t temp = big_endian_read_16(buf, pos);
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int8_t temp_integral = (int8_t)((temp >> 8) & 0xff);
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float temp_decimal = (temp & 0xff) / 256.0;
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res->inform.tlm.temperature = temp_integral + temp_decimal;
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pos += 2;
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res->inform.tlm.adv_count = big_endian_read_32(buf, pos);
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pos += 4;
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res->inform.tlm.time = big_endian_read_32(buf, pos);
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return 0;
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}
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static esp_err_t esp_eddystone_get_inform(const uint8_t* buf, uint8_t len, esp_eddystone_result_t* res)
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{
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static esp_err_t ret=-1;
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switch(res->common.frame_type)
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{
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case EDDYSTONE_FRAME_TYPE_UID: {
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ret = esp_eddystone_uid_received(buf, len, res);
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break;
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}
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case EDDYSTONE_FRAME_TYPE_URL: {
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ret = esp_eddystone_url_received(buf, len, res);
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break;
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}
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case EDDYSTONE_FRAME_TYPE_TLM: {
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ret = esp_eddystone_tlm_received(buf, len, res);
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break;
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}
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default:
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break;
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}
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return ret;
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}
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esp_err_t esp_eddystone_decode(const uint8_t* buf, uint8_t len, esp_eddystone_result_t* res)
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{
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if (len == 0 || buf == NULL || res == NULL) {
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return -1;
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}
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uint8_t pos=0;
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while(res->common.srv_data_type != EDDYSTONE_SERVICE_UUID)
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{
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pos++;
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if(pos >= len ) {
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return -1;
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}
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uint8_t ad_type = buf[pos++];
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switch(ad_type)
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{
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case ESP_BLE_AD_TYPE_FLAG: {
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res->common.flags = buf[pos++];
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break;
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}
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case ESP_BLE_AD_TYPE_16SRV_CMPL: {
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uint16_t uuid = little_endian_read_16(buf, pos);
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if(uuid != EDDYSTONE_SERVICE_UUID) {
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return -1;
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}
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res->common.srv_uuid = uuid;
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pos += 2;
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break;
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}
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case ESP_BLE_AD_TYPE_SERVICE_DATA: {
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uint16_t type = little_endian_read_16(buf, pos);
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pos += 2;
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uint8_t frame_type = buf[pos++];
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if(type != EDDYSTONE_SERVICE_UUID || !(frame_type == EDDYSTONE_FRAME_TYPE_UID || frame_type == EDDYSTONE_FRAME_TYPE_URL ||
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frame_type == EDDYSTONE_FRAME_TYPE_TLM)) {
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return -1;
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}
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res->common.srv_data_type = type;
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res->common.frame_type = frame_type;
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break;
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}
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default:
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break;
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}
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}
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return esp_eddystone_get_inform(buf+pos, len-pos, res);
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}
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