API tools faq
paste
Advertisement
Guest User

Untitled

a guest
Feb 26th, 2018
91
0
Never
Add comment
Not a member of Pastebin yet? Sign Up, it unlocks many cool features!
text 12.92 KB | None | 0 0
raw download clone embed print report
  1. import usocket as socket
  2. import ustruct as struct
  3. from ubinascii import hexlify
  4.  
  5. class MQTTException(Exception):
  6. pass
  7.  
  8. class MQTTClient:
  9.  
  10. def __init__(self, client_id, server, port=0, user=None, password=None, keepalive=0,
  11. ssl=False, ssl_params={}):
  12. if port == 0:
  13. port = 8883 if ssl else 1883
  14. self.client_id = client_id
  15. self.sock = None
  16. self.server = server
  17. self.port = port
  18. self.ssl = ssl
  19. self.ssl_params = ssl_params
  20. self.pid = 0
  21. self.cb = None
  22. self.user = user
  23. self.pswd = password
  24. self.keepalive = keepalive
  25. self.lw_topic = None
  26. self.lw_msg = None
  27. self.lw_qos = 0
  28. self.lw_retain = False
  29.  
  30. def _send_str(self, s):
  31. self.sock.write(struct.pack("!H", len(s)))
  32. self.sock.write(s)
  33.  
  34. def _recv_len(self):
  35. n = 0
  36. sh = 0
  37. while 1:
  38. b = self.sock.read(1)[0]
  39. n |= (b & 0x7f) << sh
  40. if not b & 0x80:
  41. return n
  42. sh += 7
  43.  
  44. def set_callback(self, f):
  45. self.cb = f
  46.  
  47. def set_last_will(self, topic, msg, retain=False, qos=0):
  48. assert 0 <= qos <= 2
  49. assert topic
  50. self.lw_topic = topic
  51. self.lw_msg = msg
  52. self.lw_qos = qos
  53. self.lw_retain = retain
  54.  
  55. def connect(self, clean_session=True):
  56. self.sock = socket.socket()
  57. addr = socket.getaddrinfo(self.server, self.port)[0][-1]
  58. self.sock.connect(addr)
  59. if self.ssl:
  60. import ussl
  61. self.sock = ussl.wrap_socket(self.sock, **self.ssl_params)
  62. premsg = bytearray(b"\x10\0\0\0\0\0")
  63. msg = bytearray(b"\x04MQTT\x04\x02\0\0")
  64.  
  65. sz = 10 + 2 + len(self.client_id)
  66. msg[6] = clean_session << 1
  67. if self.user is not None:
  68. sz += 2 + len(self.user) + 2 + len(self.pswd)
  69. msg[6] |= 0xC0
  70. if self.keepalive:
  71. assert self.keepalive < 65536
  72. msg[7] |= self.keepalive >> 8
  73. msg[8] |= self.keepalive & 0x00FF
  74. if self.lw_topic:
  75. sz += 2 + len(self.lw_topic) + 2 + len(self.lw_msg)
  76. msg[6] |= 0x4 | (self.lw_qos & 0x1) << 3 | (self.lw_qos & 0x2) << 3
  77. msg[6] |= self.lw_retain << 5
  78.  
  79. i = 1
  80. while sz > 0x7f:
  81. premsg[i] = (sz & 0x7f) | 0x80
  82. sz >>= 7
  83. i += 1
  84. premsg[i] = sz
  85.  
  86. self.sock.write(premsg, i + 2)
  87. self.sock.write(msg)
  88. #print(hex(len(msg)), hexlify(msg, ":"))
  89. self._send_str(self.client_id)
  90. if self.lw_topic:
  91. self._send_str(self.lw_topic)
  92. self._send_str(self.lw_msg)
  93. if self.user is not None:
  94. self._send_str(self.user)
  95. self._send_str(self.pswd)
  96. resp = self.sock.read(4)
  97. assert resp[0] == 0x20 and resp[1] == 0x02
  98. if resp[3] != 0:
  99. raise MQTTException(resp[3])
  100. return resp[2] & 1
  101.  
  102. def disconnect(self):
  103. self.sock.write(b"\xe0\0")
  104. self.sock.close()
  105.  
  106. def ping(self):
  107. self.sock.write(b"\xc0\0")
  108.  
  109. def publish(self, topic, msg, retain=False, qos=0):
  110. pkt = bytearray(b"\x30\0\0\0")
  111. pkt[0] |= qos << 1 | retain
  112. sz = 2 + len(topic) + len(msg)
  113. if qos > 0:
  114. sz += 2
  115. assert sz < 2097152
  116. i = 1
  117. while sz > 0x7f:
  118. pkt[i] = (sz & 0x7f) | 0x80
  119. sz >>= 7
  120. i += 1
  121. pkt[i] = sz
  122. #print(hex(len(pkt)), hexlify(pkt, ":"))
  123. self.sock.write(pkt, i + 1)
  124. self._send_str(topic)
  125. if qos > 0:
  126. self.pid += 1
  127. pid = self.pid
  128. struct.pack_into("!H", pkt, 0, pid)
  129. self.sock.write(pkt, 2)
  130. self.sock.write(msg)
  131. if qos == 1:
  132. while 1:
  133. op = self.wait_msg()
  134. if op == 0x40:
  135. sz = self.sock.read(1)
  136. assert sz == b"\x02"
  137. rcv_pid = self.sock.read(2)
  138. rcv_pid = rcv_pid[0] << 8 | rcv_pid[1]
  139. if pid == rcv_pid:
  140. return
  141. elif qos == 2:
  142. assert 0
  143.  
  144. def subscribe(self, topic, qos=0):
  145. assert self.cb is not None, "Subscribe callback is not set"
  146. pkt = bytearray(b"\x82\0\0\0")
  147. self.pid += 1
  148. struct.pack_into("!BH", pkt, 1, 2 + 2 + len(topic) + 1, self.pid)
  149. #print(hex(len(pkt)), hexlify(pkt, ":"))
  150. self.sock.write(pkt)
  151. self._send_str(topic)
  152. self.sock.write(qos.to_bytes(1, "little"))
  153. while 1:
  154. op = self.wait_msg()
  155. if op == 0x90:
  156. resp = self.sock.read(4)
  157. #print(resp)
  158. assert resp[1] == pkt[2] and resp[2] == pkt[3]
  159. if resp[3] == 0x80:
  160. raise MQTTException(resp[3])
  161. return
  162.  
  163. # Wait for a single incoming MQTT message and process it.
  164. # Subscribed messages are delivered to a callback previously
  165. # set by .set_callback() method. Other (internal) MQTT
  166. # messages processed internally.
  167. def wait_msg(self):
  168. res = self.sock.read(1)
  169. self.sock.setblocking(True)
  170. if res is None:
  171. return None
  172. if res == b"":
  173. raise OSError(-1)
  174. if res == b"\xd0": # PINGRESP
  175. sz = self.sock.read(1)[0]
  176. assert sz == 0
  177. return None
  178. op = res[0]
  179. if op & 0xf0 != 0x30:
  180. return op
  181. sz = self._recv_len()
  182. topic_len = self.sock.read(2)
  183. topic_len = (topic_len[0] << 8) | topic_len[1]
  184. topic = self.sock.read(topic_len)
  185. sz -= topic_len + 2
  186. if op & 6:
  187. pid = self.sock.read(2)
  188. pid = pid[0] << 8 | pid[1]
  189. sz -= 2
  190. msg = self.sock.read(sz)
  191. self.cb(topic, msg)
  192. if op & 6 == 2:
  193. pkt = bytearray(b"\x40\x02\0\0")
  194. struct.pack_into("!H", pkt, 2, pid)
  195. self.sock.write(pkt)
  196. elif op & 6 == 4:
  197. assert 0
  198.  
  199. # Checks whether a pending message from server is available.
  200. # If not, returns immediately with None. Otherwise, does
  201. # the same processing as wait_msg.
  202. def check_msg(self):import usocket as socket
  203. import ustruct as struct
  204. from ubinascii import hexlify
  205.  
  206. class MQTTException(Exception):
  207. pass
  208.  
  209. class MQTTClient:
  210.  
  211. def __init__(self, client_id, server, port=0, user=None, password=None, keepalive=0,
  212. ssl=False, ssl_params={}):
  213. if port == 0:
  214. port = 8883 if ssl else 1883
  215. self.client_id = client_id
  216. self.sock = None
  217. self.server = server
  218. self.port = port
  219. self.ssl = ssl
  220. self.ssl_params = ssl_params
  221. self.pid = 0
  222. self.cb = None
  223. self.user = user
  224. self.pswd = password
  225. self.keepalive = keepalive
  226. self.lw_topic = None
  227. self.lw_msg = None
  228. self.lw_qos = 0
  229. self.lw_retain = False
  230.  
  231. def _send_str(self, s):
  232. self.sock.write(struct.pack("!H", len(s)))
  233. self.sock.write(s)
  234.  
  235. def _recv_len(self):
  236. n = 0
  237. sh = 0
  238. while 1:
  239. b = self.sock.read(1)[0]
  240. n |= (b & 0x7f) << sh
  241. if not b & 0x80:
  242. return n
  243. sh += 7
  244.  
  245. def set_callback(self, f):
  246. self.cb = f
  247.  
  248. def set_last_will(self, topic, msg, retain=False, qos=0):
  249. assert 0 <= qos <= 2
  250. assert topic
  251. self.lw_topic = topic
  252. self.lw_msg = msg
  253. self.lw_qos = qos
  254. self.lw_retain = retain
  255.  
  256. def connect(self, clean_session=True):
  257. self.sock = socket.socket()
  258. addr = socket.getaddrinfo(self.server, self.port)[0][-1]
  259. self.sock.connect(addr)
  260. if self.ssl:
  261. import ussl
  262. self.sock = ussl.wrap_socket(self.sock, **self.ssl_params)
  263. premsg = bytearray(b"\x10\0\0\0\0\0")
  264. msg = bytearray(b"\x04MQTT\x04\x02\0\0")
  265.  
  266. sz = 10 + 2 + len(self.client_id)
  267. msg[6] = clean_session << 1
  268. if self.user is not None:
  269. sz += 2 + len(self.user) + 2 + len(self.pswd)
  270. msg[6] |= 0xC0
  271. if self.keepalive:
  272. assert self.keepalive < 65536
  273. msg[7] |= self.keepalive >> 8
  274. msg[8] |= self.keepalive & 0x00FF
  275. if self.lw_topic:
  276. sz += 2 + len(self.lw_topic) + 2 + len(self.lw_msg)
  277. msg[6] |= 0x4 | (self.lw_qos & 0x1) << 3 | (self.lw_qos & 0x2) << 3
  278. msg[6] |= self.lw_retain << 5
  279.  
  280. i = 1
  281. while sz > 0x7f:
  282. premsg[i] = (sz & 0x7f) | 0x80
  283. sz >>= 7
  284. i += 1
  285. premsg[i] = sz
  286.  
  287. self.sock.write(premsg, i + 2)
  288. self.sock.write(msg)
  289. #print(hex(len(msg)), hexlify(msg, ":"))
  290. self._send_str(self.client_id)
  291. if self.lw_topic:
  292. self._send_str(self.lw_topic)
  293. self._send_str(self.lw_msg)
  294. if self.user is not None:
  295. self._send_str(self.user)
  296. self._send_str(self.pswd)
  297. resp = self.sock.read(4)
  298. assert resp[0] == 0x20 and resp[1] == 0x02
  299. if resp[3] != 0:
  300. raise MQTTException(resp[3])
  301. return resp[2] & 1
  302.  
  303. def disconnect(self):
  304. self.sock.write(b"\xe0\0")
  305. self.sock.close()
  306.  
  307. def ping(self):
  308. self.sock.write(b"\xc0\0")
  309.  
  310. def publish(self, topic, msg, retain=False, qos=0):
  311. pkt = bytearray(b"\x30\0\0\0")
  312. pkt[0] |= qos << 1 | retain
  313. sz = 2 + len(topic) + len(msg)
  314. if qos > 0:
  315. sz += 2
  316. assert sz < 2097152
  317. i = 1
  318. while sz > 0x7f:
  319. pkt[i] = (sz & 0x7f) | 0x80
  320. sz >>= 7
  321. i += 1
  322. pkt[i] = sz
  323. #print(hex(len(pkt)), hexlify(pkt, ":"))
  324. self.sock.write(pkt, i + 1)
  325. self._send_str(topic)
  326. if qos > 0:
  327. self.pid += 1
  328. pid = self.pid
  329. struct.pack_into("!H", pkt, 0, pid)
  330. self.sock.write(pkt, 2)
  331. self.sock.write(msg)
  332. if qos == 1:
  333. while 1:
  334. op = self.wait_msg()
  335. if op == 0x40:
  336. sz = self.sock.read(1)
  337. assert sz == b"\x02"
  338. rcv_pid = self.sock.read(2)
  339. rcv_pid = rcv_pid[0] << 8 | rcv_pid[1]
  340. if pid == rcv_pid:
  341. return
  342. elif qos == 2:
  343. assert 0
  344.  
  345. def subscribe(self, topic, qos=0):
  346. assert self.cb is not None, "Subscribe callback is not set"
  347. pkt = bytearray(b"\x82\0\0\0")
  348. self.pid += 1
  349. struct.pack_into("!BH", pkt, 1, 2 + 2 + len(topic) + 1, self.pid)
  350. #print(hex(len(pkt)), hexlify(pkt, ":"))
  351. self.sock.write(pkt)
  352. self._send_str(topic)
  353. self.sock.write(qos.to_bytes(1, "little"))
  354. while 1:
  355. op = self.wait_msg()
  356. if op == 0x90:
  357. resp = self.sock.read(4)
  358. #print(resp)
  359. assert resp[1] == pkt[2] and resp[2] == pkt[3]
  360. if resp[3] == 0x80:
  361. raise MQTTException(resp[3])
  362. return
  363.  
  364. # Wait for a single incoming MQTT message and process it.
  365. # Subscribed messages are delivered to a callback previously
  366. # set by .set_callback() method. Other (internal) MQTT
  367. # messages processed internally.
  368. def wait_msg(self):
  369. res = self.sock.read(1)
  370. self.sock.setblocking(True)
  371. if res is None:
  372. return None
  373. if res == b"":
  374. raise OSError(-1)
  375. if res == b"\xd0": # PINGRESP
  376. sz = self.sock.read(1)[0]
  377. assert sz == 0
  378. return None
  379. op = res[0]
  380. if op & 0xf0 != 0x30:
  381. return op
  382. sz = self._recv_len()
  383. topic_len = self.sock.read(2)
  384. topic_len = (topic_len[0] << 8) | topic_len[1]
  385. topic = self.sock.read(topic_len)
  386. sz -= topic_len + 2
  387. if op & 6:
  388. pid = self.sock.read(2)
  389. pid = pid[0] << 8 | pid[1]
  390. sz -= 2
  391. msg = self.sock.read(sz)
  392. self.cb(topic, msg)
  393. if op & 6 == 2:
  394. pkt = bytearray(b"\x40\x02\0\0")
  395. struct.pack_into("!H", pkt, 2, pid)
  396. self.sock.write(pkt)
  397. elif op & 6 == 4:
  398. assert 0
  399.  
  400. # Checks whether a pending message from server is available.
  401. # If not, returns immediately with None. Otherwise, does
  402. # the same processing as wait_msg.
  403. def check_msg(self):
  404. self.sock.setblocking(False)
  405. return self.wait_msg()
  406.  
  407. self.sock.setblocking(False)
  408. return self.wait_msg()
Advertisement
Add Comment
Please, Sign In to add comment
Advertisement
Public Pastes
Advertisement
We use cookies for various purposes including analytics. By continuing to use Pastebin, you agree to our use of cookies as described in the Cookies Policy.  OK, I Understand
Not a member of Pastebin yet?
Sign Up, it unlocks many cool features!