Bluetooth (Wikipedia) is a wireless technology standard for exchanging data over short distances (using short-wavelength UHF radio waves in the ISM band from 2.4 to 2.485 GHz) from fixed and mobile devices, and building personal area networks (PANs).
evive has dedicated Bluetooth (HC05) headers, which just requires you to connect the HC05 Bluetooth module.
The HC-05 module is an easy-to-use Bluetooth SPP (Serial Port Protocol) module, designed for transparent wireless serial connection setup. Serial port Bluetooth module is fully qualified Bluetooth V2.0+EDR (Enhanced Data Rate) 3Mbps Modulation with complete 2.4GHz radio transceiver and baseband.
The HM-10 is a readily available Bluetooth 4.0 module based on the Texas Instruments CC2540 or CC2541 Bluetooth low energy (BLE) System on Chip (SoC).
Serial Port 3 of evive is directly connected to the serial ports of Bluetooth. All the data transmission hence happens through serial port 3.