I see perfect adapter from Adafruit Bluefruit LE Friend but need wait a time to delivery and already exists some PT9048.

Why not use and check Bluefruit LE Friend features ?

1. Connect PT9048 to J-Link adapter and start nRFgo Studio
2. Program S110 nRF51822 7.1.0 softdevice
3. Program application blefriend_s110_xxaa_0_3_1_141112_blefriend_debug.hex
4. Connect with wires to USB-UART adapter (only 3.3V !!!

Command and Data mode works fine.