It is said that both iBeacon and Eddystone formats are supported when checking the specification. In this case, only iBeacon format is supported.
(https://wiki.aprbrother.com/en/AprilBeacon.html => Features)
I kept receiving data for 10 minutes, but the beacon only sends iBeacon format data.
(Advertising Filter => Allow All Advertising Data)
**please tell me ** Is this beacon only sending iBeacon format? Or do I need to change something?
Finally I received the tlm data.
00 (adv type)
E6DC8783A116 (mac)
DB (rssi)
0201060303AAFE1116AAFE20000D141A80020F1D050E77A5B0 (adv data => tlm format)
see the function for convert battery voltage to percent. We copied the codes from nordic’s SDK
/** @brief Function for converting the input voltage (in milli volts) into percentage of 3.0 Volts.
*
* @details The calculation is based on a linearized version of the battery's discharge
* curve. 3.0V returns 100% battery level. The limit for power failure is 2.1V and
* is considered to be the lower boundary.
*
* The discharge curve for CR2032 is non-linear. In this model it is split into
* 4 linear sections:
* - Section 1: 3.0V - 2.9V = 100% - 42% (58% drop on 100 mV)
* - Section 2: 2.9V - 2.74V = 42% - 18% (24% drop on 160 mV)
* - Section 3: 2.74V - 2.44V = 18% - 6% (12% drop on 300 mV)
* - Section 4: 2.44V - 2.1V = 6% - 0% (6% drop on 340 mV)
*
* These numbers are by no means accurate. Temperature and
* load in the actual application is not accounted for!
*
* @param[in] mvolts The voltage in mV
*
* @return Battery level in percent.
*/
static __INLINE uint8_t battery_level_in_percent(const uint16_t mvolts)
{
uint8_t battery_level;
if (mvolts >= 3000)
{
battery_level = 100;
}
else if (mvolts > 2900)
{
battery_level = 100 - ((3000 - mvolts) * 58) / 100;
}
else if (mvolts > 2740)
{
battery_level = 42 - ((2900 - mvolts) * 24) / 160;
}
else if (mvolts > 2440)
{
battery_level = 18 - ((2740 - mvolts) * 12) / 300;
}
else if (mvolts > 2100)
{
battery_level = 6 - ((2440 - mvolts) * 6) / 340;
}
else
{
battery_level = 0;
}
return battery_level;
}
