HM-10 Bluetooth 4.0 with USB to TTL Module DIYmall

Use IOS app: HM10 Bluetooth Serial Lite
Software: SerialPort

You can connect the HM10 bluetooth module with USB to TTL module, then you can send message from your iphone to SerialPost windows

HM-10               usb to TTL module
VCC                         5V
GND                        GND
TXD                         RXD
RXD                         TXD

Open Bluetooth on iphone , ipen HM10 Bluetooth Serial Lite APP and software SerialPort, you can type message in the APP, then the message will be send to SerialPort windows