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