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    Certificate based MQTT (AWS IoT) trouble with changed umqtt

    Micropython
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    • S
      sistar_hh
      last edited by

      Hi,
      unfortunately the micropython certificate handling for MQTT has been changed last year. good description
      Here is the new way to do it:

       # Create an SSL context
    context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
    context.verify_mode = ssl.CERT_REQUIRED

    # Load certificates
    context.load_verify_locations(cafile='/flash/certificate/ca.der')
    context.load_cert_chain('/flash/certificate/cert.der', '/flash/certificate/key.der')
    mqtt = MQTTClient(client_id=client, server=endpoint, port=8883, keepalive=1200, ssl=context)
    print("Connecting to AWS IoT...")
    mqtt.connect()
    print("Done")

      While the code and certificates work fine on ESP32-S3 Micropython they result in the following error on uiflow2

      Traceback (most recent call last):
  File "<stdin>", line 74, in <module>
  File "<stdin>", line 52, in mqtt_connect
  File "/flash/libs/umqttn/simple.py", line 69, in connect
  File "ssl.py", line 1, in wrap_socket
ValueError: 
The certificate validity has expired

      I triple checked the certificate validity..
      Next suspect would be an incorrect system time. Therfore I set the time as follows before attempting to initialize a mqtt connection:

      sta_if = network.WLAN(network.STA_IF)
sta_if.active(True)
if sta_if.isconnected():
    sta_if.disconnect()
sta_if.connect(wifi_ssid, wifi_password)
while not sta_if.isconnected():
    utime.sleep(1)
    print("Connecting...")
print("Connected:", sta_if.ifconfig())


print(f"time before NTP settime {time.localtime()}")
ntptime.settime() 
print(f"time after NTP settime {time.localtime()}")
import machine
rtc = machine.RTC()
# Set manually to a known correct UTC date/time: (year, month, day, weekday, hour, minute, second, microsecond)
rtc.datetime((2025, 3, 14, 1, 14, 0, 0, 0))
print("Manually set time:", machine.RTC().datetime())

      Still I get the same error:

      Connecting...
Connecting...
Connecting...
Connecting...
Connected: ('192.168.5.0', '255.255.252.0', '192.168.4.1', '192.168.4.1')
time before NTP settime (2025, 3, 14, 12, 8, 44, 5, 72)
time after NTP settime (2025, 3, 14, 12, 8, 45, 5, 72)
Manually set time: (2025, 3, 14, 5, 14, 0, 0, 67)
Connecting to AWS IoT...
MQTT Connection failed: 
The certificate validity has expired

Traceback (most recent call last):
  File "<stdin>", line 79, in <module>
  File "<stdin>", line 57, in mqtt_connect
  File "/flash/libs/umqttn/simple.py", line 69, in connect
  File "ssl.py", line 1, in wrap_socket
ValueError: 
The certificate validity has expired

      I used the micropython/umqtt.simple/umqtt/simple.py implementation installed as module umqttn in the /flash/libs folder. It differs from the m5stack implementation (which is currently broken for certificate based MQTT due to the described changes in Micropython).

      At this point I wonder why the same code (umqtt.simple, demo-code, exactly the same certificate files) work on an UMFeatherS2 MicroPython v1.24.1 but fail on MicroPython v1.24.0-dirty on 2025-03-06; M5STACK CoreS3 with ESP32S3.

      I would happy for any hint on how to solve this.

      1 Reply Last reply Reply Quote 0
      • S
        sistar_hh
        last edited by

        @sistar_hh said in Certificate based MQTT (AWS IoT) trouble with changed umqtt:

        Hi,
        unfortunately the micropython certificate handling for MQTT has been changed last year. good description
        Here is the new way to do it:

        Create an SSL context

        context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
context.verify_mode = ssl.CERT_REQUIRED

# Load certificates
context.load_verify_locations(cafile='/flash/certificate/ca.der')
context.load_cert_chain('/flash/certificate/cert.der', '/flash/certificate/key.der')
mqtt = MQTTClient(client_id=client, server=endpoint, port=8883, keepalive=1200, ssl=context)
print("Connecting to AWS IoT...")
mqtt.connect()
print("Done")

        While the code and certificates work fine on ESP32-S3 Micropython they result in the following error on uiflow2

        Traceback (most recent call last):
        File "<stdin>", line 74, in <module>
        File "<stdin>", line 52, in mqtt_connect
        File "/flash/libs/umqttn/simple.py", line 69, in connect
        File "ssl.py", line 1, in wrap_socket
        ValueError:
        The certificate validity has expired
        I triple checked the certificate validity..
        Next suspect would be an incorrect system time. Therfore I set the time as follows before attempting to initialize a mqtt connection:

        sta_if = network.WLAN(network.STA_IF)
        sta_if.active(True)
        if sta_if.isconnected():
        sta_if.disconnect()
        sta_if.connect(wifi_ssid, wifi_password)
        while not sta_if.isconnected():
        utime.sleep(1)
        print("Connecting...")
        print("Connected:", sta_if.ifconfig())

        print(f"time before NTP settime {time.localtime()}")
        ntptime.settime()
        print(f"time after NTP settime {time.localtime()}")
        import machine
        rtc = machine.RTC()

        Set manually to a known correct UTC date/time: (year, month, day, weekday, hour, minute, second, microsecond)

        rtc.datetime((2025, 3, 14, 1, 14, 0, 0, 0))
        print("Manually set time:", machine.RTC().datetime())
        Still I get the same error:

        Connecting...
        Connecting...
        Connecting...
        Connecting...
        Connected: ('192.168.5.0', '255.255.252.0', '192.168.4.1', '192.168.4.1')
        time before NTP settime (2025, 3, 14, 12, 8, 44, 5, 72)
        time after NTP settime (2025, 3, 14, 12, 8, 45, 5, 72)
        Manually set time: (2025, 3, 14, 5, 14, 0, 0, 67)
        Connecting to AWS IoT...
        MQTT Connection failed:
        The certificate validity has expired

        Traceback (most recent call last):
        File "<stdin>", line 79, in <module>
        File "<stdin>", line 57, in mqtt_connect
        File "/flash/libs/umqttn/simple.py", line 69, in connect
        File "ssl.py", line 1, in wrap_socket
        ValueError:
        The certificate validity has expired
        I used the micropython/umqtt.simple/umqtt/simple.py implementation installed as module umqttn in the /flash/libs folder. It differs from the m5stack implementation (which is currently broken for certificate based MQTT due to the described changes in Micropython).

        At this point I wonder why the same code (umqtt.simple, demo-code, exactly the same certificate files) work on an UMFeatherS2 MicroPython v1.24.1 but fail on MicroPython v1.24.0-dirty on 2025-03-06; M5STACK CoreS3 with ESP32S3.

        I would happy for any hint on how to solve this.

        Aha! When trying the following change:
        context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
        context.verify_mode = ssl.CERT_OPTIONAL # Instead of CERT_REQUIRED
        I successfully connected!

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