Initial commit

btproxy/ble_uart_echo_client.py

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+# SPDX-FileCopyrightText: 2020 ladyada for Adafruit Industries
+# SPDX-License-Identifier: MIT
+
+"""
+Used with ble_uart_echo_test.py. Transmits "echo" to the UARTService and receives it back.
+"""
+
+import time
+
+from adafruit_ble import BLERadio
+from adafruit_ble.advertising.standard import ProvideServicesAdvertisement
+from adafruit_ble.services.nordic import UARTService
+
+ble = BLERadio()
+while True:
+    while ble.connected and any(
+        UARTService in connection for connection in ble.connections
+    ):
+        for connection in ble.connections:
+            if UARTService not in connection:
+                continue
+            print("echo")
+            uart = connection[UARTService]
+            uart.write(b"echo")
+            # Returns b'' if nothing was read.
+            one_byte = uart.read(4)
+            if one_byte:
+                print(one_byte)
+            print()
+        time.sleep(1)
+
+    print("disconnected, scanning")
+    for advertisement in ble.start_scan(ProvideServicesAdvertisement, timeout=1):
+        if UARTService not in advertisement.services:
+            continue
+        ble.connect(advertisement)
+        print("connected")
+        break
+    ble.stop_scan()