Extracting a variable from a buffer

hi all,

noob question here.

i have following code prints buff[ ] value serial monitor (it's continuous stream coming in via udp) i'd extract value , use elsewhere. in snippet below i'm trying reassign buff[ ] value new variable, t, , print that., 0 value.

any tips appreciated.

code: [select]

indata = recvfrom(sockfd, buff, sizeof(buff), 0, (sockaddr*)&from, &socklen);
 int i;
//-----print buffer contents------//
 for(i=0;i<sizeof(buff);i++){
 
  serial.print(buff[i]); // bit works expected
  int t = buff[i];
}
 
 serial.println("here comes t!");
 serial.println(t); // returns 0 value

  if (t >= 300) {
  serial.print("made it!"); // never happens
 
}}

quote

it's continuous stream coming in via udp

no, isn't. it's populated new data each time function called. not same thing.

code: [select]

  for(i=0;i<sizeof(buff);i++){
   
   serial.print(buff[i]); // bit works expected
   int t = buff[i];
}
while works, useless. copying 1 byte @ time t, of wrong type. local statement, goes out of scope when loop ends.

if snippet compiles, because have t declared somewhere else. using same name 2 different variables in 2 different, overlapping, scopes bad idea.

code: [select]

   if (t >= 300) {
since value trying assign t in range 0 255, never true.

now, need show kind of data in udp packet, can suggest ways accomplish goal work.

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