59 lines
1.9 KiB
Python
59 lines
1.9 KiB
Python
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 advertisement 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)
|