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 Smart Bluetooth Power!

CUSTOM I BEACON MODE - Transform your module into a personalized iBeacon, unlocking proximity marketing and smart notifications.
RELIABLE SUPPORTED - Backed by a 1-year warranty and responsive 24-hour customer support to keep your innovations running.
PLUG PLAY 4 PIN BASE BOARD - Simplify your wiring with dedicated VCC, GND, TX, RX pins designed for Arduino UNO, Mega 2560, and Nano boards.
REAL TIME LED STATUS INDICATOR - Stay informed with intuitive LED signals—solid light for connection, flashing for disconnection.
SEAMLESS BLUETOOTH 4 0 LE CONNECTIVITY - Effortlessly add energy-efficient Bluetooth to your Arduino projects, compatible with iPhone 4S+ and Android 4.4+.

The DSD TECH HM-10 Bluetooth 4.0 BLE iBeacon UART Module is a compact, low-energy wireless solution designed for Arduino projects. Featuring a convenient 4PIN base board for easy connection, it supports iBeacon mode and Apple Notification Center Service (ANCS), ensuring seamless integration with iOS and Android devices. With real-time LED status indicators and a robust 1-year warranty, this module empowers developers to create cutting-edge Bluetooth-enabled applications effortlessly.

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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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