ESP8266 benchmark added

ESP8266/benchmark.py

@@ -0,0 +1,56 @@
+# benchmark.py Simple benchmark for umqtt.simple
+# Assumes simple.py (from micropython-lib) is copied to ESP8266
+# Outcome with mosquitto running on a Raspberry Pi on wired network,
+# Wemos D1 Mini running on WiFi: echo received in max 154 ms min 27 ms
+
+import ubinascii
+from simple import MQTTClient
+from machine import unique_id
+from time import sleep, ticks_ms, ticks_diff
+
+SERVER = "192.168.0.23"
+CLIENT_ID = ubinascii.hexlify(unique_id())
+TOPIC = b"led"
+QOS = 1
+
+t = 0
+maxt = 0
+mint = 5000
+
+
+def sub_cb(topic, msg):
+    global t, maxt, mint
+    dt = ticks_diff(t, ticks_ms())
+    print('echo received in {} ms'.format(dt))
+    print((topic, msg))
+    maxt = max(maxt, dt)
+    mint = min(mint, dt)
+
+
+def main(quit=True):
+    global t
+    c = MQTTClient(CLIENT_ID, SERVER)
+    # Subscribed messages will be delivered to this callback
+    c.set_callback(sub_cb)
+    c.connect()
+    c.subscribe(TOPIC, qos = QOS)
+    print("Connected to %s, subscribed to %s topic" % (SERVER, TOPIC))
+    n = 0
+    pubs = 0
+    try:
+        while 1:
+            n += 1
+            if not n % 100:
+                t = ticks_ms()
+                c.publish(TOPIC, str(pubs).encode('UTF8'), retain = False, qos = QOS)
+                c.wait_msg()
+                pubs += 1
+                if not pubs % 100:
+                    print('echo received in max {} ms min {} ms'.
+                          format(maxt, mint))
+                    if quit:
+                        return
+            sleep(0.05)
+            c.check_msg()
+    finally:
+        c.disconnect()

README.md

@@ -33,6 +33,11 @@ adjust to suit your PC.
 Includes udev rules to avoid jumps from /dev/ttyACM0 to /dev/ttyACM1: ensures Pyboards of all types
 appear as /dev/pyboard. Also rules for USB connected WiPy and FTDI USB/serial adaptor.
 
+## ESP8266
+benchmark.py Tests performance by periodically publishing while subscribed to the same topic.
+Measures the round-trip delay. Adapt to suit your server address and desired QOS (quality of
+service, 0 and 1 are supported). After 100 messages reports maximum and minimum delays.
+
 # License
 
 Any code placed here is released under the MIT License (MIT).