Add timeout to read function

Fix __exit__

solar_ble.py

@@ -24,6 +24,11 @@ INTERVAL = 15
 WRITE_DEVICE = "0000ffd1-0000-1000-8000-00805f9b34fb"
 READ_DEVICE = "0000fff1-0000-1000-8000-00805f9b34fb"
 
+ACTION_READ = 0x03
+ACTION_WRITE = 0x03
+
+POSSIBLE_MARKER = (0x01, 0xFD, 0xFE, 0xFF)
+
 # get(255, 12, 2)
 # "ff 03 00 0c 00 02"
 CMD_GET_1 = b"\xff\x03\x00\x0c\x00\x02"
@@ -316,14 +321,14 @@ class BTLEUart(io.RawIOBase):
                 left = timeout - (time.time() - start)
                 if left < 0:
                     break
-                self.device.waitForNotifications(0.1)
+                self._poll()
                 try:
                     self._read_buffer.extend(self.delegate.queue.get_nowait())
                 except queue.Empty:
                     pass
             try:
                 while True:
-                    self.device.waitForNotifications(0.01)
+                    self._poll()
                     self._read_buffer.extend(self.delegate.queue.get_nowait())
 
             except queue.Empty:
@@ -334,7 +339,7 @@ class BTLEUart(io.RawIOBase):
                 left = timeout - (time.time() - start)
                 if left < 0:
                     break
-                self.device.waitForNotifications(0.1)
+                self._poll()
                 try:
                     self._read_buffer.extend(self.delegate.queue.get_nowait())
                 except queue.Empty:
@@ -360,6 +365,22 @@ class BTLEUart(io.RawIOBase):
     def readall(self) -> bytes:
         return self._read()
 
+    def read(
+        self, size: Optional[int] = None, timeout: Optional[float] = None
+    ) -> Optional[bytes]:
+        if timeout:
+            _timeout = self.timeout
+            self.timeout = timeout
+
+        if size is None:
+            res = super().read()
+        else:
+            res = super().read(size)
+
+        if timeout:
+            self.timeout = _timeout
+        return res
+
     def write(self, b: "ReadableBuffer") -> Optional[int]:
         self._ensure_connected()
         if TYPE_CHECKING:
@@ -373,8 +394,9 @@ class BTLEUart(io.RawIOBase):
     def __enter__(self):
         return self
 
-    def __exit__(self):
+    def __exit__(self, type, value, traceback):
         self.device.disconnect()
+        del self.device
 
     def seekable(self) -> bool:
         return False
@@ -403,8 +425,9 @@ def write(fh, data):
     fh.write(data + bcrc)
 
 
-def construct_request(address, words=1):
-    return struct.pack("!BBHH", 0xFF, 0x03, address, words)
+def construct_request(address, words=1, action=ACTION_READ, marker=0xFF):
+    assert marker in {POSSIBLE_MARKER}, f"marker should be one of {POSSIBLE_MARKER}"
+    return struct.pack("!BBHH", marker, action, address, words)
 
 
 def poll(dev: btle.Peripheral, timeout: float = 1) -> bool:

test_bleuart.py

@@ -1,16 +1,17 @@
 # -*- coding: utf-8 -*-
 from solar_ble import MAC, BTLEUart, construct_request, write
 
-x = BTLEUart(MAC)
+with BTLEUart(MAC, timeout=1) as x:
 
     print(x)
-write(x, construct_request(0x0C, 8))
 
-print(x.read(3))
-print(x.read(8 * 2))
-print(x.read(2))
+    write(x, construct_request(0x0E, words=3))
+    x.read(3, timeout=1)
+    print(x.read(6, timeout=0.01))
+    x.read(2, timeout=0.01)
+    print(x.timeout)
 
-x.timeout = 10
+    # x.timeout = 2
 
-print(x.read())
-print(x.read(1))
+    # print(x.read())
+    # print(x.read(1))