PRIMARY_SERVICE, GAP_SERVICE
CHARACTERISTIC, GAP_DEVICE_NAME, READ, "BTstack"
CHARACTERISTIC, GAP_APPEARANCE, READ, 00 00

PRIMARY_SERVICE, GATT_SERVICE
CHARACTERISTIC, GATT_DATABASE_HASH, READ,

PRIMARY_SERVICE, FFF0
CHARACTERISTIC, FFF1, READ | WRITE | DYNAMIC, 
CHARACTERISTIC, FFF2, READ | WRITE | DYNAMIC, 
CHARACTERISTIC, 00001234-0000-1000-8000-00805F9B34FB, READ | WRITE | DYNAMIC,