70 lines
1.9 KiB
Python
70 lines
1.9 KiB
Python
from micropython import const
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from ubluepy import Peripheral, constants
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BLE_GAP_ADV_FLAG_LE_GENERAL_DISC_MODE = const(0x02)
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BLE_GAP_ADV_FLAG_BR_EDR_NOT_SUPPORTED = const(0x04)
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BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE = const(
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BLE_GAP_ADV_FLAG_LE_GENERAL_DISC_MODE | BLE_GAP_ADV_FLAG_BR_EDR_NOT_SUPPORTED
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)
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EDDYSTONE_FRAME_TYPE_URL = const(0x10)
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EDDYSTONE_URL_PREFIX_HTTP_WWW = const(0x00) # "http://www".
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EDDYSTONE_URL_SUFFIX_DOT_COM = const(0x01) # ".com"
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def string_to_binarray(text):
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b = bytearray([])
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for c in text:
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b.append(ord(c))
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return b
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def gen_ad_type_content(ad_type, data):
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b = bytearray(1)
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b.append(ad_type)
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b.extend(data)
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b[0] = len(b) - 1
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return b
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def generate_eddystone_adv_packet(url):
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# flags
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disc_mode = bytearray([BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE])
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packet_flags = gen_ad_type_content(constants.ad_types.AD_TYPE_FLAGS, disc_mode)
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# 16-bit uuid
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uuid = bytearray([0xAA, 0xFE])
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packet_uuid16 = gen_ad_type_content(
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constants.ad_types.AD_TYPE_16BIT_SERVICE_UUID_COMPLETE, uuid
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)
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# eddystone data
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rssi = 0xEE # -18 dB, approx signal strength at 0m.
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eddystone_data = bytearray([])
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eddystone_data.append(EDDYSTONE_FRAME_TYPE_URL)
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eddystone_data.append(rssi)
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eddystone_data.append(EDDYSTONE_URL_PREFIX_HTTP_WWW)
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eddystone_data.extend(string_to_binarray(url))
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eddystone_data.append(EDDYSTONE_URL_SUFFIX_DOT_COM)
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# service data
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service_data = uuid + eddystone_data
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packet_service_data = gen_ad_type_content(
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constants.ad_types.AD_TYPE_SERVICE_DATA, service_data
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)
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# generate advertisement packet
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packet = bytearray([])
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packet.extend(packet_flags)
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packet.extend(packet_uuid16)
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packet.extend(packet_service_data)
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return packet
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def start():
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adv_packet = generate_eddystone_adv_packet("micropython")
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p = Peripheral()
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p.advertise(data=adv_packet, connectable=False)
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