edrosten
commented
5 years ago Could you post a complete, minimal example?
Open westsuhanic opened 5 years ago
edrosten
commented
5 years ago Could you post a complete, minimal example?
westsuhanic
commented
5 years ago Hello:
Here is my verson of temperature.cc. Please note that I have a version running based on the github project tinyb. The modifications I made to your stock code is to find the config handle, then once I have the config handle turn the sensor on. Next find the read handle, once I have that register the callback. I know the uuid for the config and read handles are correct as these are used in the tinyb code.
I am motivated to make this work.
=====================================================================
int main(int argc, char **argv)
{
if(argc != 2)
{
cerr << "Please supply address.\n";
cerr << "Usage:\n";
cerr << "prog
log_level = Error;
//This class does all of the GATT interactions for you.
BLEGATTStateMachine gatt;
std::function<void(const PDUNotificationOrIndication&)> notify_cb = [&](const PDUNotificationOrIndication& n)
{
auto ms_since_epoch = duration_cast<milliseconds>(system_clock::now().time_since_epoch());
float temp = bluetooth_float_to_IEEE754(n.value().first+1);
cout << setprecision(15) << ms_since_epoch.count()/1000. << " " << setprecision(5) << temp << endl;
std::cerr << "Herex." << std::endl;
};
std::function<void()> found_services_and_characteristics_cb = [&gatt, ¬ify_cb](){
//Find config handle then try to turn the temp sensor on.
for(auto& service: gatt.primary_services)
{
char *ytmp = (char *)calloc(300,sizeof(char));
bt_uuid_to_string( (const bt_uuid_t *)&service.uuid, ytmp, 300 );
std::cerr << "Y->" << ytmp << std::endl;
//Find temperature service.
if( service.uuid == UUID("f000aa00-0451-4000-b000-000000000000") )
{
//for(Characteristic& characteristic: service.characteristics)
for(auto& characteristic: service.characteristics)
{
char *xtmp = (char *)calloc(300,sizeof(char));
bt_uuid_to_string( (const bt_uuid_t *)&characteristic.uuid, xtmp, 300 );
std::cerr << "X->" << xtmp << std::endl;
if(characteristic.uuid == UUID("f000aa02-0451-4000-b000-000000000000"))
{
//characteristic.write_request(uint8_t(1));
//characteristic.cb_notify_or_indicate = notify_cb;
//characteristic.set_notify_and_indicate(true, false);
std::cerr << "Found config handle." << std::endl;
//Turn the temp sensor on.
characteristic.write_request(uint8_t(0x01));
}
else if(characteristic.uuid == UUID("f000aa01-0451-4000-b000-000000000000"))
{
std::cerr << "Found read handle." << std::endl;
//Read values of off temp sensor.
//characteristic.cb_notify_or_indicate = notify_cb;
//characteristic.set_notify_and_indicate(true, false);
}
free( xtmp );
}
}
free( ytmp );
}
//Find the read handle after turning the sensor on and read the
//temperature sensor.
for(auto& service: gatt.primary_services)
{
char *ytmp = (char *)calloc(300,sizeof(char));
bt_uuid_to_string( (const bt_uuid_t *)&service.uuid, ytmp, 300 );
std::cerr << "Y->" << ytmp << std::endl;
//Find temperature service.
if( service.uuid == UUID("f000aa00-0451-4000-b000-000000000000") )
{
//for(Characteristic& characteristic: service.characteristics)
for(auto& characteristic: service.characteristics)
{
char *xtmp = (char *)calloc(300,sizeof(char));
bt_uuid_to_string( (const bt_uuid_t *)&characteristic.uuid, xtmp, 300 );
std::cerr << "X->" << xtmp << std::endl;
if(characteristic.uuid == UUID("f000aa02-0451-4000-b000-000000000000"))
{
//characteristic.write_request(uint8_t(1));
//characteristic.cb_notify_or_indicate = notify_cb;
//characteristic.set_notify_and_indicate(true, false);
std::cerr << "Found config handle." << std::endl;
//Turn the temp sensor on.
//characteristic.write_request(uint8_t(1));
}
else if(characteristic.uuid == UUID("f000aa01-0451-4000-b000-000000000000"))
{
std::cerr << "Found read handle." << std::endl;
unsigned int microseconds = 10000000;
usleep(microseconds);
//Read values of off temp sensor.
characteristic.cb_notify_or_indicate = notify_cb;
characteristic.set_notify_and_indicate(true, false);
}
free( xtmp );
}
}
free( ytmp );
}
};
//I think this one is reasonably clear?
gatt.cb_disconnected = [](BLEGATTStateMachine::Disconnect d)
{
cerr << "Disconnect for reason " << BLEGATTStateMachine::get_disconnect_string(d) << endl;
exit(1);
};
//This is how to use the blocking interface. It is very simple. You provide the main
//loop and just hammer on the state machine struct.
gatt.connect_blocking(argv[1]);
for(;;)
gatt.read_and_process_next();I run the program via the following command:
sudo ./temperature 54:6C:0E:52:F9:1F
The ouptut is: Y->1800 Y->1801 Y->180a Y->180f Y->f000aa00-0451-4000-b000-000000000000 X->f000aa01-0451-4000-b000-000000000000 Found read handle. X->f000aa02-0451-4000-b000-000000000000 Found config handle. X->f000aa03-0451-4000-b000-000000000000 Y->f000aa20-0451-4000-b000-000000000000 Y->f000aa40-0451-4000-b000-000000000000 Y->f000aa80-0451-4000-b000-000000000000 Y->f000aa70-0451-4000-b000-000000000000 Y->ffe0 Y->f000aa64-0451-4000-b000-000000000000 Y->f000ac00-0451-4000-b000-000000000000 Y->f000ccc0-0451-4000-b000-000000000000 Y->f000ffc0-0451-4000-b000-000000000000 Y->1800 Y->1801 Y->180a Y->180f Y->f000aa00-0451-4000-b000-000000000000 X->f000aa01-0451-4000-b000-000000000000 Found read handle. terminate called after throwing an instance of 'std::logic_error' what(): Error trying to issue command mid state Aborted
thank you for your time.
west suhanic
Hello:
Thank you for your work.
I would like to use your library to control a TI Sensor Tag. However it is not clear to me how I would do the following:
1)turning on the sensor tag by writing 0x01 to the characteristic f000aa02-0451-4000-b000-000000000000 2)Then reading the data by a read request on f000aa01-0451-4000-b000-000000000000
I have modified your temperature.cc code however whenever I try to turn on the sensor tag by writing 0x01-(using characteristic.write_request(uint8_t(1)); ) the program exits with a logic error.
Any help is appreciated.
west suhanic