BLE handler

Author: dastels

CircuitPython_Logger/ble_handler.py

@@ -0,0 +1,68 @@
+"""
+UART based message handler for CircuitPython logging.
+
+Adafruit invests time and resources providing this open source code.
+Please support Adafruit and open source hardware by purchasing
+products from Adafruit!
+
+Written by Dave Astels for Adafruit Industries
+Copyright (c) 2018 Adafruit Industries
+Licensed under the MIT license.
+
+All text above must be included in any redistribution.
+"""
+
+
+#pylint:disable=missing-super-argument
+
+# Example:
+#
+# import board
+# import busio
+# from uart_handler import UartHandler
+# import adafruit_logging as logging
+#
+# uart = busio.UART(board.TX, board.RX, baudrate=115200)
+# logger = logging.getLogger('uart')
+# logger.addHandler(UartHandler(uart))
+# logger.level = logging.INFO
+# logger.info('testing')
+
+from adafruit_logging import LoggingHandler
+from adafruit_ble.uart import UARTServer
+
+class BLEHandler(LoggingHandler):
+    """Send logging output to the BLE uart port."""
+
+    def __init__(self):
+        """Create an instance.
+
+        :param uart: the busio.UART instance to which to write messages
+
+        """
+        self._advertising_now = False
+        self._uart = UARTServer()
+        self._uart.start_advertising()
+
+    def format(self, level, msg):
+        """Generate a string to log.
+
+        :param level: The level at which to log
+        :param msg: The core message
+
+        """
+        return super().format(level, msg) + '\r\n'
+
+    def emit(self, level, msg):
+        """Generate the message and write it to the UART.
+
+        :param level: The level at which to log
+        :param msg: The core message
+
+        """
+        while not self._uart.connected:
+            pass
+
+        data = bytes(self.format(level, msg), 'utf-8')
+        for i in range(len(data)):
+            self._uart.write(data[i:i+1])

CircuitPython_Logger/ble_test.py

@@ -0,0 +1,28 @@
+import time
+import random
+from ble_handler import BLEHandler
+import adafruit_logging as logging
+
+l = logging.getLogger('ble')
+
+l.addHandler(BLEHandler())
+
+def go():
+    while True:
+        t = random.randint(1, 5)
+        if t == 1:
+            print('debug')
+            l.debug("debug message: %d", random.randint(0, 1000))
+        elif t == 2:
+            print('info')
+            l.info("info message: %d", random.randint(0, 1000))
+        elif t == 3:
+            print('warning')
+            l.warning("warning message: %d", random.randint(0, 1000))
+        elif t == 4:
+            print('error')
+            l.error("error message: %d", random.randint(0, 1000))
+        elif t == 5:
+            print('critical')
+            l.critical("critical message: %d", random.randint(0, 1000))
+        time.sleep(5.0 + (random.random() * 5.0))