# SPDX-FileCopyrightText: 2020 Jerry Needell for Adafruit Industries
# SPDX-License-Identifier: MIT

# Example to send a packet periodically

import time

import board
import busio
import digitalio

import adafruit_rfm69

# set the time interval (seconds) for sending packets
transmit_interval = 10

# Define radio parameters.
RADIO_FREQ_MHZ = 915.0  # Frequency of the radio in Mhz. Must match your
# module! Can be a value like 915.0, 433.0, etc.

# Define pins connected to the chip.
CS = digitalio.DigitalInOut(board.CE1)
RESET = digitalio.DigitalInOut(board.D25)

# Initialize SPI bus.
spi = busio.SPI(board.SCK, MOSI=board.MOSI, MISO=board.MISO)

# Initialze RFM radio
rfm69 = adafruit_rfm69.RFM69(spi, CS, RESET, RADIO_FREQ_MHZ)

# Optionally set an encryption key (16 byte AES key). MUST match both
# on the transmitter and receiver (or be set to None to disable/the default).
rfm69.encryption_key = b"\x01\x02\x03\x04\x05\x06\x07\x08\x01\x02\x03\x04\x05\x06\x07\x08"

# initialize counter
counter = 0
# send a broadcast mesage
rfm69.send(bytes(f"message number {counter}", "UTF-8"))

# Wait to receive packets.
print("Waiting for packets...")
# initialize flag and timer
send_reading = False
time_now = time.monotonic()
while True:
    # Look for a new packet - wait up to 5 seconds:
    packet = rfm69.receive(timeout=5.0)
    # If no packet was received during the timeout then None is returned.
    if packet is not None:
        # Received a packet!
        # Print out the raw bytes of the packet:
        print(f"Received (raw bytes): {packet}")
        # send reading after any packet received
    if time.monotonic() - time_now > transmit_interval:
        # reset timeer
        time_now = time.monotonic()
        # clear flag to send data
        send_reading = False
        counter = counter + 1
        rfm69.send(bytes(f"message number {counter}", "UTF-8"))
