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from bleak import BleakClient
import asyncio
CHAR_ID = "49535343-8841-43f4-a8d4-ecbe34729bb3"
HEADER1 = 0xef
HEADER2 = 0xdd
def encode(msgType,payload):
bytes=bytearray(5+len(payload))
bytes[0] = HEADER1
bytes[1] = HEADER2
bytes[2] = msgType
cksum1 = 0
cksum2 = 0
for i in range(len(payload)):
val = payload[i] & 0xff
bytes[3+i] = val
if (i % 2 == 0):
cksum1 += val
else:
cksum2 += val
bytes[len(payload) + 3] = (cksum1 & 0xFF)
bytes[len(payload) + 4] = (cksum2 & 0xFF)
return bytes
msgs = {
"tare": encode(4, [0]),
"startTimer": encode(13, [0,0]),
"stopTimer": encode(13, [0,2]),
"resetTimer": encode(13, [0,1]),
"heartbeat": encode(0, [2,0])
}
def encodeId(isPyxisStyle=False):
if isPyxisStyle:
payload = bytearray([0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x30,0x31,0x32,0x33,0x34])
else:
payload = bytearray([0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d])
return encode(11,payload)
async def main():
async with BleakClient("33:11:22:33:44") as client:
print("connected")
print("Writing id...")
await client.write_gatt_char(CHAR_ID, encodeId(isPyxisStyle=False))
for i in msgs:
if i == "heartbeat":
continue
await asyncio.sleep(5)
await client.write_gatt_char(CHAR_ID, msgs["heartbeat"])
await asyncio.sleep(1)
print(f"Writing {i}...")
print(f"Writing {msgs[i]}...")
await client.write_gatt_char(CHAR_ID, msgs[i])
asyncio.run(main())
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