Timeout improvements (#464)

- Only start to count the timer inside the lock.
- Improve precision of the timeout option.
- Use a context manager for the connection.
- Remove SO_REUSEADDR option.

Amend: Revert retry_intvl (#506)

broadlink/device.py

@@ -70,13 +70,14 @@ def scan(
     packet[0x20] = checksum & 0xFF
     packet[0x21] = checksum >> 8
 
-    starttime = time.time()
+    start_time = time.time()
     discovered = []
 
     try:
-        while (time.time() - starttime) < timeout:
+        while (time.time() - start_time) < timeout:
+            time_left = timeout - (time.time() - start_time)
+            conn.settimeout(min(1, time_left))
             conn.sendto(packet, (discover_ip_address, discover_ip_port))
-            conn.settimeout(1)
 
             while True:
                 try:
@@ -307,22 +308,22 @@ class device:
         packet[0x20] = checksum & 0xFF
         packet[0x21] = checksum >> 8
 
-        start_time = time.time()
         with self.lock:
-            conn = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
-            conn.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+            with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as conn:
+                timeout = self.timeout
+                start_time = time.time()
 
                 while True:
-                try:
+                    time_left = timeout - (time.time() - start_time)
+                    conn.settimeout(min(1, time_left))
                     conn.sendto(packet, self.host)
-                    conn.settimeout(1)
-                    resp, _ = conn.recvfrom(2048)
+
+                    try:
+                        resp = conn.recvfrom(2048)[0]
                         break
                     except socket.timeout:
-                    if (time.time() - start_time) > self.timeout:
-                        conn.close()
+                        if (time.time() - start_time) > timeout:
                             raise exception(-4000)  # Network timeout.
-            conn.close()
 
         if len(resp) < 0x30:
             raise exception(-4007)  # Length error.

broadlink/remote.py

@@ -58,7 +58,9 @@ class rm(device):
     def check_sensors(self) -> dict:
         """Return the state of the sensors."""
         resp = self._send(0x1)
-        return {"temperature": resp[0x0] + resp[0x1] / 10.0}
+        temperature = struct.unpack("<bb", resp[:0x2])
+        temperature = temperature[0x0] + temperature[0x1] / 10.0
+        return {"temperature": temperature}
 
 
 class rm4(rm):
@@ -90,7 +92,7 @@ class rm4(rm):
     def check_sensors(self) -> dict:
         """Return the state of the sensors."""
         resp = self._send(0x24)
-        return {
-            "temperature": resp[0x0] + resp[0x1] / 100.0,
-            "humidity": resp[0x2] + resp[0x3] / 100.0,
-        }
+        temperature = struct.unpack("<bb", resp[:0x2])
+        temperature = temperature[0x0] + temperature[0x1] / 100.0
+        humidity = resp[0x2] + resp[0x3] / 100.0
+        return {"temperature": temperature, "humidity": humidity}

broadlink/sensor.py

@@ -1,4 +1,6 @@
 """Support for sensors."""
+import struct
+
 from .device import device
 from .exceptions import check_error
 
@@ -33,10 +35,15 @@ class a1(device):
         response = self.send_packet(0x6A, packet)
         check_error(response[0x22:0x24])
         payload = self.decrypt(response[0x38:])
-        data = bytearray(payload[0x4:])
+        data = payload[0x4:]
+
+        temperature = struct.unpack("<bb", data[:0x2])
+        temperature = temperature[0x0] + temperature[0x1] / 10.0
+        humidity = data[0x2] + data[0x3] / 10.0
+
         return {
-            "temperature": data[0x0] + data[0x1] / 10.0,
-            "humidity": data[0x2] + data[0x3] / 10.0,
+            "temperature": temperature,
+            "humidity": humidity,
             "light": data[0x4],
             "air_quality": data[0x6],
             "noise": data[0x8],