-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathnus_modem_server.py
229 lines (206 loc) · 10 KB
/
nus_modem_server.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
# (c) 2024 ekspla.
# MIT License. https://github.com/ekspla/micropython_aioble_examples
#
# An example pair of codes using YMODEM/Nordic UART Service.
import sys
sys.path.append('')
from micropython import const
import machine
import os
import asyncio
import aioble
import bluetooth
from array import array
_NUS_SERVICE_UUID = bluetooth.UUID("6e400001-b5a3-f393-e0a9-e50e24dcca9e")
_NUS_RX_CHARACTERISTIC_UUID = bluetooth.UUID("6e400002-b5a3-f393-e0a9-e50e24dcca9e")
_NUS_TX_CHARACTERISTIC_UUID = bluetooth.UUID("6e400003-b5a3-f393-e0a9-e50e24dcca9e")
_ADV_APPEARANCE_GENERIC_COMPUTER = const(128)
# How frequently to send advertising beacons.
_ADV_INTERVAL_US = const(250_000)
VALUE_SOH = bytearray([0x01]) # SOH == 128-byte data
#VALUE_STX = bytearray([0x02]) # STX == 1024-byte data
VALUE_C = bytearray([0x43]) # 'C'
#VALUE_G = bytearray([0x47]) # 'G'
VALUE_ACK = bytearray([0x06]) # ACK
VALUE_NAK = bytearray([0x15]) # NAK
VALUE_EOT = bytearray([0x04]) # EOT
#VALUE_CAN = bytearray([0x18]) # CAN
##_FILEPATH = '/sd/test.bin'
_FILEPATH = 'test.bin'
class NUSModemServer:
def __init__(self):
# Register GATT server.
nus_service = aioble.Service(_NUS_SERVICE_UUID)
# Client (Central) -> Server (Peripheral)
self.rx_characteristic = aioble.Characteristic(
nus_service, _NUS_RX_CHARACTERISTIC_UUID, write=True, write_no_response=True,
capture=True,
)
# Server (Peripheral) -> Client (Central)
self.tx_characteristic = aioble.BufferedCharacteristic(
nus_service, _NUS_TX_CHARACTERISTIC_UUID, notify=True,
max_len=20,
)
aioble.register_services(nus_service)
# **Block**
self.block_data_size = 128
self.block_buf = bytearray(3 + self.block_data_size + 2) # Header(SOH, num, ~num); data; CRC16
self.block_num = 0 # Block number(0-255).
#self.idx_block_buf = 0 # Index in block_buf.
self.mv_block_buf = memoryview(self.block_buf)
self.block_data = self.mv_block_buf[3:-2]
self.block_crc = self.mv_block_buf[-2:]
#self.block_error = False
# **File** A file is made of blocks; a block is made of packets.
self.data_size = 0
self.data_read = 0
self.filename = ''
#self.read_buf = bytearray(self.block_data_size * 4)
#self.mv_read_buf = memoryview(self.read_buf)
#self.read_buf_page = tuple(self.mv_read_buf[i*self.block_data_size:(i+1)*self.block_data_size] for i in range(4))
#self.idx_read_buf = 0
def construct_block_zero(self):
self.block_num = -1
self.data_size = os.stat(_FILEPATH)[6]
##filename = _FILEPATH.split('/')[-1]
filename = _FILEPATH
header = bytes(f'{filename} {self.data_size}', 'utf-8')
self.block_data[:len(header)] = header
self.construct_block(len(header))
def construct_block(self, nbytes):
while nbytes < self.block_data_size:
self.block_data[nbytes] = 0x00 # Zero padding to the end.
nbytes += 1
self.block_num = (self.block_num + 1) % 256
self.block_buf[1] = self.block_num
self.block_buf[2] = 0xFF ^ self.block_num
self.block_crc[:] = self.crc16_arc(self.block_data).to_bytes(2, 'big')
async def send_block(self, char, delay_ms): # Send a block through packets.
for i in range(6):
char.notify(self.connection, self.mv_block_buf[i*20:(i+1)*20])
char.notify(self.connection, self.mv_block_buf[120:])
await asyncio.sleep_ms(delay_ms)
async def wait_until_data(self, char, t_ms=10_000):
try:
_, data = await char.written(timeout_ms=t_ms)
return data
except asyncio.TimeoutError:
print(f"Something went wrong. No new data received.")
sys.exit()
##await self.connection.disconnect()
async def main(self):
while True:
async with await aioble.advertise(
_ADV_INTERVAL_US,
name="mpy-nus",
services=[_NUS_SERVICE_UUID],
appearance=_ADV_APPEARANCE_GENERIC_COMPUTER,
) as connection:
print("Connection from", connection.device)
self.connection = connection
print("Waiting for 'C'.")
# Receive 'C'.
if await self.wait_until_data(self.rx_characteristic) != bytes(VALUE_C):
await self.connection.disconnect()
else:
print("'C' was received.")
self.block_buf[0] = VALUE_SOH[0] # Always use 128 byte/block.
# Send block number zero. Receive ACK.
self.construct_block_zero()
retries = 3
while retries > 0:
await self.send_block(self.tx_characteristic, delay_ms=5)
if await self.wait_until_data(self.rx_characteristic) == bytes(VALUE_ACK):
break
retries -= 1
if retries == 0: # Too many errors; cancel transport.
print("Too many errors.")
#await self.connection.disconnect()
sys.exit()
# Receive 'C'.
if await self.wait_until_data(self.rx_characteristic) != bytes(VALUE_C):
await self.connection.disconnect()
else:
print("The second 'C' was received.")
# Send blocks of number >= 1
with open(_FILEPATH, 'rb') as f:
while self.connection.is_connected():
if (nbytes := f.readinto(self.block_data)):
self.construct_block(nbytes)
self.data_read += nbytes
while True:
await self.send_block(self.tx_characteristic, delay_ms=5)
if await self.wait_until_data(self.rx_characteristic) == bytes(VALUE_ACK):
break
else:
# Send EOT
self.tx_characteristic.notify(self.connection, VALUE_EOT)
# Receive NAK
if await self.wait_until_data(self.rx_characteristic) != bytes(VALUE_NAK):
await self.connection.disconnect()
# Send EOT
self.tx_characteristic.notify(self.connection, VALUE_EOT)
# Receive ACK
if await self.wait_until_data(self.rx_characteristic) != bytes(VALUE_ACK):
await self.connection.disconnect()
print('File transmission finished.')
print(f'File size: {self.data_size}. Transmitted size: {self.data_read}.')
await self.connection.disconnect()
print("Disconnected.")
@micropython.viper
def crc16_arc(self, byte_array) -> int:
'''crc16/arc
XOSS uses CRC16/ARC instead of CRC16/XMODEM.
'''
crc: int = 0
data = ptr8(byte_array)
length = int(len(byte_array))
table = ptr16(CRC16_ARC_TBL)
i: int = 0
while i < length:
crc = (crc >> 8) ^ table[(crc ^ data[i]) & 0xff]
i += 1
return crc
CRC16_ARC_TBL = array("H", (
0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,
0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,
0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,
0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,
0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,
0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,
0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,
0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,
0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,
0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,
0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,
0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,
0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,
0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,
0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,
0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,
0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,
0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,
0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,
0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,
0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640,
0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041,
0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241,
0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440,
0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40,
0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841,
0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40,
0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41,
0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,
0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040,
))
def start():
#freq = machine.freq()
#machine.freq(240_000_000)
server = NUSModemServer()
try:
asyncio.run(server.main())
finally:
asyncio.new_event_loop() # Clear retained state.
#machine.freq(freq)