examples/lorawan-nano-gateway: Improve downlink frequency accuracy.

Author: Daniel Campora

examples/lorawan-nano-gateway/abp_node.py

@@ -35,7 +35,9 @@
 s.setblocking(False)
 
 for i in range (200):
-    s.send(b'PKT #' + bytes([i]))
+    pkt = b'PKT #' + bytes([i])
+    print('Sending:', pkt)
+    s.send(pkt)
     time.sleep(4)
     rx, port = s.recvfrom(256)
     if rx:

examples/lorawan-nano-gateway/abp_node_US915.py

@@ -34,7 +34,9 @@
 s.setblocking(False)
 
 for i in range (200):
-    s.send(b'PKT #' + bytes([i]))
+    pkt = b'PKT #' + bytes([i])
+    print('Sending:', pkt)
+    s.send(pkt)
     time.sleep(4)
     rx, port = s.recvfrom(256)
     if rx:

examples/lorawan-nano-gateway/nanogateway.py

@@ -157,7 +157,7 @@ def start(self):
         _thread.start_new_thread(self._udp_thread, ())
 
         # initialize the LoRa radio in LORA mode
-        self._log('Setting up the LoRa radio at {:.1f} Mhz using {}', self._freq_to_float(self.frequency), self.datarate)
+        self._log('Setting up the LoRa radio at {} Mhz using {}', self._freq_to_float(self.frequency), self.datarate)
         self.lora = LoRa(
             mode=LoRa.LORA,
             frequency=self.frequency,
@@ -344,7 +344,7 @@ def _send_down_link(self, data, tmst, datarate, frequency):
             pass
         self.lora_sock.send(data)
         self._log(
-            'Sent downlink packet scheduled on {:.3f}, at {:.1f} Mhz using {}: {}',
+            'Sent downlink packet scheduled on {:.3f}, at {:.3f} Mhz using {}: {}',
             tmst / 1000000,
             self._freq_to_float(frequency),
             datarate,
@@ -370,15 +370,15 @@ def _udp_thread(self):
                     ack_error = TX_ERR_NONE
                     tx_pk = ujson.loads(data[4:])
                     tmst = tx_pk["txpk"]["tmst"]
-                    t_us = tmst - utime.ticks_us() - 12500
+                    t_us = tmst - utime.ticks_us() - 15000
                     if t_us < 0:
                         t_us += 0xFFFFFFFF
                     if t_us < 20000000:
                         self.uplink_alarm = Timer.Alarm(
                             handler=lambda x: self._send_down_link(
                                 ubinascii.a2b_base64(tx_pk["txpk"]["data"]),
                                 tx_pk["txpk"]["tmst"] - 50, tx_pk["txpk"]["datr"],
-                                int(tx_pk["txpk"]["freq"] * 1000000)
+                                int(tx_pk["txpk"]["freq"] * 1000) * 1000
                             ), 
                             us=t_us
                         )

examples/lorawan-nano-gateway/otaa_node.py

@@ -44,7 +44,9 @@
 time.sleep(5.0)
 
 for i in range (200):
-    s.send(b'PKT #' + bytes([i]))
+    pkt = b'PKT #' + bytes([i])
+    print('Sending:', pkt)
+    s.send(pkt)
     time.sleep(4)
     rx, port = s.recvfrom(256)
     if rx:

examples/lorawan-nano-gateway/otaa_node_US915.py

@@ -51,7 +51,9 @@
 time.sleep(5.0)
 
 for i in range (200):
-    s.send(b'PKT #' + bytes([i]))
+    pkt = b'PKT #' + bytes([i])
+    print('Sending:', pkt)
+    s.send(pkt)
     time.sleep(4)
     rx, port = s.recvfrom(256)
     if rx: