RF receiver for integer only, how to cast uint8_t to int?

Question

I'm using the RadioHead library with ASK Driver to transmit/receive data with generic RF modules. It works fine, but I'm lacking some knowledge in programming the code to use the data received. Most examples I could find show how to send a string, but I only need to send and receive an integer.

I'm sending the decimal value '1' through the transmitter:

 uint8_t *data;
 uint8_t value;
 void loop() {
 value = 1;
 data = &value;
 driver.send(data, sizeof(value));
 driver.waitPacketSent();
 delay(200);
 }

And I have in the receiver:

void loop() {
 uint8_t buf[RH_ASK_MAX_MESSAGE_LEN];
 uint8_t buflen = sizeof(buf);
 int value;
 if (driver.recv(buf, &buflen)) {
 driver.printBuffer("Received:", buf, buflen); //prints 1.
 value = (int) buf; //my attempt to cast
 Serial.println(value); // the output is 2233, so this is wrong.
 }
 if (value == 1){ //example
 Serial.println("good");
 }
}

So what I think it is, I'm receiving bytes from the transmitter, which the library function 'driver.printBuffer' reinterprets as decimals and prints the value '1'. But how do I interpret (or cast) this as an integer so I can use it for other things like in the example (If condition) at the end? Any help is very much appreciated. Thanks.

Answer 1

buf is a pointer to the received bytes. Try value = buf[0]; instead.

• Chris Stratton: This of course only works for small positive values that fit in an 8-bit type. For larger values you will need to be more sophisticated.