title: How to write to a Characteristic as of Bluez 5.48
body: <p>I am using Bluez 5.50; 5.48 was the version acquire-write became officially (non-experimentally) supported. Am I using the acquire-write / write feature properly? </p>
  
  <p>On my Raspberry Pi Zero W: </p>
  
  <pre><code>pi@raspberrypi:~ $ bluetoothctl
  [bluetooth]# power on
  Changing power on succeeded
  [bluetooth]# scan on
  Discovery started
  [bluetooth]# connect B8:27:E8:72:33:7A
  Attempting to connect to B8:27:E8:72:33:7A
  Connection successful
  [DSD TECH]# menu gatt
  [DSD TECH]# select-attribute 0000ffe1-0000-1000-8000-00805f9b34fb
  [DSD TECH:/service0010/char0011]# acquire-write
  [CHG] Attribute /org/bluez/hci0/dev_B8_27_E8_72_33_7A/service0010/char0011 WriteAcquired: yes
  AcquireWrite success: fd 7 MTU 23
  [DSD TECH:/service0010/char0011]# write("h")
  [DSD TECH:/service0010/char0011]# write('h')
  [DSD TECH:/service0010/char0011]# write(h)
  [DSD TECH:/service0010/char0011]# write(0x68)
  </code></pre>
  
  <p>On my Arduino Nano connected to HM-10:</p>
  
  <pre><code>void setup() 
  {
    Serial.begin(9600);
  }
  
  void loop() {
    delay(10);
    if (Serial.available())
    {
      char c = Serial.read();
      Serial.println("Read value");
    }
  }
  </code></pre>
  
  <p>I use the iOS app named "Serial" which connects to my HM-10. I send the letter h over and read "Read value" on the arduino serial monitor. I do this directly before and after using the raspberry pi, on the same arduino serial monitor. The raspberry pi notifications never come thru. Yes, I am certain it is the same HM-10. It is the only HM-10 I have powered on in BLE range, and I cannot connect to the UUID while my phone is connected. (Actually, I submit <code>connect B8:27:E8:72:33:7A</code> to the raspberry pi, and keeps trying, and then disconnect from phone, and rpi automatically connects). </p>
  
  <p>Thanks in advance!</p>