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BLEService.cpp
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BLEService.cpp
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#include "BLEService.h"
//set of predefined MAC addrs valid for processing
std::unordered_set<std::string> desiredAddrs;
//Is called within valFile.cpp main
int InitDesiredAddrs()
{
desiredAddrs.insert("D2:C3:81:9B:35:B9");
desiredAddrs.insert("F2:02:F0:6B:77:8D");
desiredAddrs.insert("CF:42:45:51:60:42");
desiredAddrs.insert("EC:A6:17:33:83:66");
desiredAddrs.insert("C9:0E:DB:EA:12:02");
desiredAddrs.insert("04:91:62:97:8B:38");
//more addresses can be added here
return 0;
}
//resets BLE
int BLEReset()
{
system("sudo hciconfig hci0 down");
system("sudo hciconfig hci0 up");
return 0;
}
//parses the terminal output by newline char first
//then parses those lines by space to separate the name and addr
int ParseHcitoolLescan(std::string terminalOutput, std::unordered_map<std::string, int> &foundMap)
{
std::stringstream ss(terminalOutput);
std::string to;
if(!terminalOutput.empty())
{
while(getline(ss,to,'\n'))
{
std::stringstream to_ss(to);
std::string finalAddress;
if(!to.empty())
{
while(getline(to_ss,finalAddress,' '))
{
if(finalAddress.size() == MAC_ADDR_LEN)
{
foundMap[finalAddress] = 0;
}
}
}
}
}
return 0;
}
int ParseBtmgmtFind(std::string terminalOutput, std::unordered_map<std::string, int> &foundMap)
{
std::stringstream lineStream(terminalOutput);
std::string lineHolder;
std::string devAddr;
std::string devRssi;
if(!terminalOutput.empty())
{
while(getline(lineStream, lineHolder)) //get each line
{
std::stringstream tokenStream(lineHolder); //stringstream for line
std::string tokenHolder;
std::vector<std::string> line; //vector for tokens within each line
while(getline(tokenStream, tokenHolder, ' ')) //would like to break if [1] not "dev_found:" instead of tokenizing whole string no matter what
{
line.push_back(tokenHolder);
}
if(line[1].compare(DEV_FOUND_STR) == 0) //if equal meaning correct line with the info
{
devAddr = line[MAC_INDEX_BT]; //addr index in cmd line output
devRssi = line[RSSI_INDEX_BT]; //rssi index in cmd line output
devRssi = devRssi.erase(0, 1); //erase '-' in front of rssi to get only int value cmd output: "-22" we want "22"
int rssi = stoi(devRssi); //cast to int
foundMap[devAddr] = rssi; //save addr and rssi in map
}
}
}
return 0;
}
std::string GetStdoutFromCommand(std::string cmd)
{
std::string data;
FILE * stream;
const int max_buffer = 256;
char buffer[max_buffer];
cmd.append(" 2>&1");
BLEReset();
stream = popen(cmd.c_str(), "r");
if(stream)
{
while(!feof(stream))
{
if(fgets(buffer, max_buffer, stream) != NULL)
{
data.append(buffer);
}
}
pclose(stream);
}
return data;
}
//TODO: scan multiple times to ensure the beacon that is selected is truly the closest one
std::string BLEService()
{
//map of all MAC addrs and their RSSI values in a scan
std::unordered_map<std::string, int> foundAddrs;
//may of all MAC addrs and their RSSI found in the scan that are ready to be processed
std::unordered_map<std::string, int> approvedAddrs;
bool beaconFound = false;
//iterators
std::unordered_map<std::string, int>:: iterator foundAddrsItr;
std::unordered_set<std::string>:: iterator desiredAddrsItr;
std::unordered_map<std::string, int>:: iterator approvedAddrsItr;
std::string cmnd = GetStdoutFromCommand(BTMGMT_FIND); //gets all output from command line
ParseBtmgmtFind(cmnd, foundAddrs); //gets desired output into foundAddrs
for(foundAddrsItr = foundAddrs.begin(); foundAddrsItr != foundAddrs.end(); foundAddrsItr++) //iterates through all of the addrs found in the scan
{
desiredAddrsItr = desiredAddrs.find(foundAddrsItr->first); //searches for found addr in the set of predefined addrs for a match
if(desiredAddrsItr != desiredAddrs.end() && foundAddrsItr->second < RSSI_MIN_VAL)
{
approvedAddrs[foundAddrsItr->first] = foundAddrsItr->second; //adds matches and their rssi value to map of approved addrs
beaconFound = true;
}
}
//RSSI Check
if(beaconFound)
{
int currRssi, minRssi = (approvedAddrs.begin())->second; //set the minimum rssi to the first approved addrs rssi and compare from there
std::string minKey = (approvedAddrs.begin())->first;
for(approvedAddrsItr = approvedAddrs.begin(); approvedAddrsItr != approvedAddrs.end(); approvedAddrsItr++) //iterate through approved addrs
{
currRssi = approvedAddrsItr->second; //set current rssi to next element
if(currRssi < minRssi) //comapre and switch accordingly to get min rssi out of the approved addrs
{
minRssi = currRssi;
minKey = approvedAddrsItr->first;
}
}
return minKey;
}
else
{
return NULL_STR;
}
}