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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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