How do you select master or slave modes?

First you have to build the circuit shown at : //electronics.stackexchange.com/questions/412525/when-i-write-data-to-a-ble-characteristic-ffe1-to-send-data-over-bluetooth-is/412561#412561 (had to make that non-clickable to be able to post). After that you upload the code (shown at that same link) to your Arduino. Finally, you will be able to connect to the device thru your Arduino and the Arduino dev environment using the Serial Monitor. At that point you can send commands to the HM-10 which will allow you to put it into different modes.

can i use this to turn things on and off through bluetooth from my iphone?

You can use this to turn things off with your phone. However, you'll need a few things: 1) An app (Android or iOS depending on what type of phone you have) to connect to the device and send data. 2) This device will be connected to a controlling microprocessor (such as an Arduino) so that when this device receives data that your app has sent then the microprocessor will examine the data and determine what to do such as applying voltage to a relay which results in the relay switching off which turns off the thing (such as an LED or whatever).

Able to send text to the serial monitor(arduino) but can't send anything back or use AT commands any help?

You may need a voltage divider on hm-10 Rx. I have built a circuit and have Arduino code that works with these modules and I posted it at : //electronics.stackexchange.com/questions/412525/when-i-write-data-to-a-ble-characteristic-ffe1-to-send-data-over-bluetooth-is/412561

Can this receive iBeacon signals? I want to be able to detect iBeacons.

yes, review the documentation for AT commands that do this.... device returns a list of received beacons

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🚀 Elevate your Arduino game with Bluetooth 4.0 LE — connect smarter, build faster!

SMART I BEACON MODE - Transform your module into a personalized iBeacon for proximity marketing or smart notifications.
RELIABLE SUPPORTED - Backed by a 1-year warranty and responsive 24-hour support, ensuring your project never stalls.
PLUG PLAY 4 PIN BASE BOARD - Simplify your wiring with dedicated VCC, GND, TX, RX pins designed for Arduino UNO R3, Mega 2560, and Nano.
SEAMLESS BLUETOOTH 4 0 LE CONNECTIVITY - Effortlessly add low-energy Bluetooth to your Arduino projects with HM-10’s cutting-edge BLE tech.
APPLE NOTIFICATION CENTER SERVICE ANCS - Stay ahead with native iOS notification support, enabling real-time alerts directly from your iPhone.

The DSD TECH HM-10 Bluetooth 4.0 BLE module with a 4PIN base board offers low-energy wireless communication compatible with iPhone 4S and later. Designed for Arduino platforms, it features easy connectivity via VCC, GND, TX, RX pins, supports iBeacon mode, and integrates Apple Notification Center Service (ANCS) for seamless iOS notifications. Operating between 3.3V to 6V with a default baud rate of 9600, it comes with a one-year warranty and dedicated customer support.

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Brand	DSD TECH
Product Dimensions	3.05 x 1.52 x 0.25 cm; 5.1 g
Item model number	ML-HM-10
Manufacturer	DSD TECH
Color	Multicoloured
Processor Brand	Apple
RAM Size	32 KB
Memory Technology	DDR4
Computer Memory Type	EEPROM
Memory Clock Speed	3600 MHz
Wireless Type	Bluetooth
Voltage	5 Volts
Operating System	Android 4.4, iOS
Are Batteries Included	No
Item Weight	5.09 g

DSD TECH HM-10 Bluetooth 4.0 BLE iBeacon UART Module with 4PIN Base Board for Arduino UNO R3 Mega 2560 Nano

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