.

SerialEmulator.py

@@ -0,0 +1,35 @@
+import os, subprocess, serial, time
+
+# this script lets you emulate a serial device
+# the client program should use the serial port file specifed by client_port
+
+# if the port is a location that the user can't access (ex: /dev/ttyUSB0 often),
+# sudo is required
+
+class SerialEmulator(object):
+    def __init__(self, device_port='./ttydevice', client_port='./ttyclient'):
+        self.device_port = device_port
+        self.client_port = client_port
+        cmd=['/usr/bin/socat','-d','-d','PTY,link=%s,raw,echo=0' %
+                self.device_port, 'PTY,link=%s,raw,echo=0' % self.client_port]
+        self.proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        time.sleep(1)
+        self.serial = serial.Serial(self.device_port, 9600, rtscts=True, dsrdtr=True)
+        self.err = ''
+        self.out = ''
+
+    def write(self, out):
+        self.serial.write(out)
+
+    def read(self):
+        line = ''
+        while self.serial.inWaiting() > 0:
+            line += self.serial.read(1)
+        return line
+
+    def __del__(self):
+        self.stop()
+
+    def stop(self):
+        self.proc.kill()
+        self.out, self.err = self.proc.communicate()

main.py

@@ -0,0 +1,30 @@
+from pyLoraRFM9x import LoRa, ModemConfig
+from SerialEmulator import SerialEmulator
+emulator = SerialEmulator('./ttydevice','./ttyclient') 
+
+# This is our callback function that runs when a message is received
+def on_recv(payload):
+    print("From:", payload.header_from)
+    print("Received:", payload.message)
+    print("RSSI: {}; SNR: {}".format(payload.rssi, payload.snr))
+    emulator.write(payload.message)
+
+
+# Use chip select 1. GPIO pin 5 will be used for interrupts and set reset pin to 25
+# The address of this device will be set to 2
+lora = LoRa(1, 5, 2, reset_pin = 25, modem_config=ModemConfig.Bw125Cr45Sf128, tx_power=14, acks=True)
+lora.on_recv = on_recv
+
+# Send a message to a recipient device with address 10
+# Retry sending the message twice if we don't get an  acknowledgment from the recipient
+message = "Hello there!"
+while True:
+    message = emulator.read()
+    if message != '':
+        status = lora.send_to_wait(message, 10, retries=2)
+        if status is True:
+            print("Message sent!")
+        else:
+            print("No acknowledgment from recipient")
+
+emulator.stop()