Parse Bluetooth string

Question

I'm developing on android with bluetooth LTE, I can send hex codes, but I send one code at time, so I need to send many informations in this way, how can I recognize a string and save the datas inside an array to parse it later?

Here is my sketch:

 char c=' ';
 String inString,one,check;
 char inData[11];
 char inChar;
 int counter=0;
 bool started = false;
 bool ended = false;
 byte index;
boolean NL = true;
const int LED1 = 6;
const int LED2 = 7;
const int LED3 = 2;
const int LED4 = 3;
const int LED5 = 4;
const int LED6 = 5;
void setup() {
 Serial.begin(9600);
 Serial.print("Sketch: "); Serial.println(__FILE__);
 Serial.print("Uploaded: "); Serial.println(__DATE__);
 Serial.println(" ");
 BTserial.begin(9600); 
 Serial.println("BTserial started at 9600");
 pinMode(LED1, OUTPUT);
 pinMode(LED2, OUTPUT);
 pinMode(LED3, OUTPUT);
 pinMode(LED4, OUTPUT);
 pinMode(LED5, OUTPUT);
 pinMode(LED6, OUTPUT);
}
void loop() {
 if (BTserial.available()>0)
 {
 Serial.print("bts: ");
 Serial.println(BTserial.available());
 c = BTserial.read();
 check = String(c, HEX); 
 if(check=="ffbc"){
 Serial.println("check");
 index=0;
 while (BTserial.available()>0){
 inChar = BTserial.read();
 check=String(inChar,HEX); 
 if(check != "0xfff3")
 {
 inData[index] = inChar;
 index++;
 }
 }
 for (int i=0;i<=11;i++){
 one = String(inData[i], HEX); 
 Serial.print(i);Serial.print(": ");Serial.println(one);
 };
 }
 if(check=="ffca"){
 // Serial.write(c);
 digitalWrite(LED1, !digitalRead(LED1));
 }
 if(check=="ffcb"){
 //Serial.write(c);
 digitalWrite(LED2, !digitalRead(LED2));
 }
 if(check=="ffcc"){
 //Serial.write(c);
 digitalWrite(LED3, !digitalRead(LED3));
 }
 if(check=="ffcd"){
 //Serial.write(c);
 digitalWrite(LED4, !digitalRead(LED4));
 }
 if(check=="ffce"){
 // Serial.write(c);
 digitalWrite(LED5, !digitalRead(LED5));
 }
 if(check=="ffcf"){
 // Serial.write(c);
 digitalWrite(LED6, !digitalRead(LED6));
 }
 }
}

Without the loop I can read all the single datas, but for my job it's not enough, to recognize the data applications I send a "sample string" to recognize the type of informations I want to send.

Answer 1

i think i solved in some way, i send always the same codes at the start and at the end of the datas, so i can racognize the end and then i parse the first element of the destination array. tell me what you think abou, if it could help someone else:

 if (BTserial.available()>0)
{
 c = BTserial.read();
 check = String(c, HEX); 
 if(check!="fff3"){ // i always start wit an fff3
 inData[index] = c;
 index++;
 }
 else if(check=="fff3"){ //end of data
 index=0; //reset the index for the next set of data
 if(String(inData[1], HEX)=="ffbc"){
 Serial.println("read the next 10 data of the array");
 }else if(String(inData[1], HEX)=="11"){
 Serial.println("turn on led 1");
 }
 // for more operations use a switch/case over the if
 }

• chrisl: Why are you using a string to check for the start/end data? You can simply use the hex representation: if(c == 0xfff3). And I'm a bit confused, that you have a 4-digit hex code for one read operation. If you use the SoftwareSerial library as your BTserial object, a call of the read() function returns one byte at a time, so it would be a 2-digit hex code
• peppeg85: hi, i'm using the bluetooth nativescript plugin, i don't know why but if i send a character after 9 arduino receives ffxx, (if i send 0xaa, it sends 0xffaa). when i made the first experiments i couldnt understnd the set of characters to parse, so i found the string. for the btserial i use altsoftserial