Receiving serial data from Android via bluetooth LE(HM-10)

Using Arduino Programming Questions
1

Hey guys,
Im just trying to read a small text called "*sync#", sent from an android app to the arduino via BLE module HM-10

Whenever i press a button, the app converts the string "*sync#" to bytes and transmits it.
But while receiving it in arduino, I am getting each character separately.

I want to read all the bytes at one go, and store it in a single String.

I have attached a screenshot of output in serial window.

Here is the arduino code:

#include <AltSoftSerial.h>

AltSoftSerial bt; //8,9 RX/TX

void setup() {
  // put your setup code here, to run once:
 Serial.begin(9600);
 bt.begin(9600);
 boolean flag;
 String str;   
 
}



void loop() {

   if(bt.available())
   {
       String str="";
       
        while(bt.available()>0)
        {
           char temp = bt.read();
           str+=temp;
        }
       
      str+='\n';
      Serial.print("Received string: ");
      Serial.println(str);  
   }
}

I dont understand this behavior. Please help me out. Thanks in advance :smiley:

Capture.PNG
Capture.PNG615×529 7.94 KB

2

Have a look at the examples in Serial Input Basics - simple reliable ways to receive data. Especially look at the 3rd example. It looks like your data is using an asterisk as the start marker and the pound sign # as the end marker.

...R