Move to umqtt.robust

Add more info about device
Freeze lib with mpy-cross
Some code factorization

code/lib/umqtt/robust.py

@@ -0,0 +1,43 @@
+import utime
+from . import simple
+
+class MQTTClient(simple.MQTTClient):
+
+    DELAY = 2
+    DEBUG = False
+
+    def delay(self, i):
+        utime.sleep(self.DELAY)
+
+    def log(self, in_reconnect, e):
+        if self.DEBUG:
+            if in_reconnect:
+                print("mqtt reconnect: %r" % e)
+            else:
+                print("mqtt: %r" % e)
+
+    def reconnect(self):
+        i = 0
+        while 1:
+            try:
+                return super().connect(False)
+            except OSError as e:
+                self.log(True, e)
+                i += 1
+                self.delay(i)
+
+    def publish(self, topic, msg, retain=False, qos=0):
+        while 1:
+            try:
+                return super().publish(topic, msg, retain, qos)
+            except OSError as e:
+                self.log(False, e)
+            self.reconnect()
+
+    def wait_msg(self):
+        while 1:
+            try:
+                return super().wait_msg()
+            except OSError as e:
+                self.log(False, e)
+            self.reconnect()

code/lib/umqtt/simple.py

@@ -1,11 +1,3 @@
-# Copyright (c) 2019, Pycom Limited.
-#
-# This software is licensed under the GNU GPL version 3 or any
-# later version, with permitted additional terms. For more information
-# see the Pycom Licence v1.0 document supplied with this file, or
-# available at https://www.pycom.io/opensource/licensing
-#
-
 import usocket as socket
 import ustruct as struct
 from ubinascii import hexlify
@@ -21,7 +13,8 @@ class MQTTClient:
             port = 8883 if ssl else 1883
         self.client_id = client_id
         self.sock = None
-        self.addr = socket.getaddrinfo(server, port)[0][-1]
+        self.server = server
+        self.port = port
         self.ssl = ssl
         self.ssl_params = ssl_params
         self.pid = 0
@@ -61,24 +54,36 @@ class MQTTClient:
 
     def connect(self, clean_session=True):
         self.sock = socket.socket()
-        self.sock.connect(self.addr)
+        addr = socket.getaddrinfo(self.server, self.port)[0][-1]
+        self.sock.connect(addr)
         if self.ssl:
             import ussl
             self.sock = ussl.wrap_socket(self.sock, **self.ssl_params)
-        msg = bytearray(b"\x10\0\0\x04MQTT\x04\x02\0\0")
-        msg[1] = 10 + 2 + len(self.client_id)
-        msg[9] = clean_session << 1
+        premsg = bytearray(b"\x10\0\0\0\0\0")
+        msg = bytearray(b"\x04MQTT\x04\x02\0\0")
+
+        sz = 10 + 2 + len(self.client_id)
+        msg[6] = clean_session << 1
         if self.user is not None:
-            msg[1] += 2 + len(self.user) + 2 + len(self.pswd)
-            msg[9] |= 0xC0
+            sz += 2 + len(self.user) + 2 + len(self.pswd)
+            msg[6] |= 0xC0
         if self.keepalive:
             assert self.keepalive < 65536
-            msg[10] |= self.keepalive >> 8
-            msg[11] |= self.keepalive & 0x00FF
+            msg[7] |= self.keepalive >> 8
+            msg[8] |= self.keepalive & 0x00FF
         if self.lw_topic:
-            msg[1] += 2 + len(self.lw_topic) + 2 + len(self.lw_msg)
-            msg[9] |= 0x4 | (self.lw_qos & 0x1) << 3 | (self.lw_qos & 0x2) << 3
-            msg[9] |= self.lw_retain << 5
+            sz += 2 + len(self.lw_topic) + 2 + len(self.lw_msg)
+            msg[6] |= 0x4 | (self.lw_qos & 0x1) << 3 | (self.lw_qos & 0x2) << 3
+            msg[6] |= self.lw_retain << 5
+
+        i = 1
+        while sz > 0x7f:
+            premsg[i] = (sz & 0x7f) | 0x80
+            sz >>= 7
+            i += 1
+        premsg[i] = sz
+
+        self.sock.write(premsg, i + 2)
         self.sock.write(msg)
         #print(hex(len(msg)), hexlify(msg, ":"))
         self._send_str(self.client_id)