Datasheet

on the 'other side' use the recvFromAck which will receive and acknowledge a packet

That function will wait forever. If you'd like to timeout while waiting for a packet, use recvfromAckTimeout which will

wait an indicated # of milliseconds

if (rf69_manager.sendtoWait((uint8_t *)radiopacket, strlen(radiopacket), DEST_ADDRESS)) {

// Wait for a message addressed to us from the client

uint8_t len = sizeof(buf);

uint8_t from;

if (rf69_manager.recvfromAck(buf, &len, &from)) {

if (rf69_manager.recvfromAckTimeout(buf, &len, 2000, &from))

https://learn.adafruit.com/adafruit-rfm69hcw-and-rfm96-rfm95-rfm98-lora-packet-padio-

breakouts

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