Joseph Jakpa asked 6 years ago
I am working with the mqtt examples for uPython, i adapted the example given to do something different. My code is suppose to publish a simple message when light levels drops below a given threshold. but i get this error:
download ok
exec(open('main.py').read(),globals())
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<string>", line 43
SyntaxError: invalid syntax
below is my main.py
from machine import Pin, ADC
from time import sleep
ldr = ADC(0)
def sub_cb(topic, msg):
print((topic, msg))
if topic == b'notification' and msg == b'received':
print('ESP received hello message')
def connect_and_subscribe():
global client_id, mqtt_server, topic_sub
client = MQTTClient(client_id, mqtt_server)
client.set_callback(sub_cb)
client.connect()
client.subscribe(topic_sub)
print('Connected to %s MQTT broker, subscribed to %s topic' % (mqtt_server, topic_sub))
return client
def restart_and_reconnect():
print('Failed to connect to MQTT broker. Reconnecting...')
time.sleep(10)
machine.reset()
try:
client = connect_and_subscribe()
except OSError as e:
restart_and_reconnect()
while True:
ldrValue = ldr.read()
print(ldrValue)
sleep(0.1)
if ldrValue >= 350
msg = b'laser0'
client.publish(topic_pub, msg)
last_message = time.time()
counter += 1
except OSError as e:
restart_and_reconnect()
Rui Santos Staff answered 6 years ago
Hello Joseph, what’s your line 43 in that script? Can you tell me the line and double-check the indentation. According to that error, it’s usually missing some spaces.
Rui Santos Staff answered 6 years ago
Did you double-check the spacing?
Unfortunately the forum doesn’t support MicroPython spacing, you should use pastebin.com to share properly formatted MicroPython scripts
Joseph Jakpa answered 6 years ago
Yes. I double checked that spacing. I made sure they’re all tabbed in two spaces. Nutbfor clarity purpose here’s the code on paste bin. https://pastebin.com/kcuRfR2A
Rui Santos Staff answered 6 years ago
The spacing does look right. However, line 43 is:
last_message = time.time()
What’s that line doing? I think you can delete it
Joseph Jakpa answered 6 years ago
Deleted that line. Didn’t fix the problem, and oh, the error is now line 41 which is
msg = b'laser
‘
Rui Santos Staff answered 6 years ago
Hello Joseph,
This is your problem at line 40, there’s a : missing after the if statement. it needs to be something like this:
You also had your indentation wrong (specially in the while true). It should now be fixed the indentation, but I’m not sure if it will work as expected, because I couldn’t try it.
I apologize for taking so long to get back to you, but I’ve been with an eye problem and I had to limit my access to screens (computer/smartphones).
Joseph Jakpa answered 6 years ago
Thanks for the reply Rui. I’ll test it and give feed back. btw, there’s s protective eye glass you can buy (if you do no already own one) that blocks the harmful uv light from your eyes.
Rui Santos Staff answered 6 years ago
Thanks for the tip, I had an allergic infection, so it’s nothing to do with the screens. However avoid screens helped getting better faster. Let me know your results.