OSError: [Errno 12] ENOMEM ESP32-Micropython-Azure-Event-Hub-Client

Hi,
I'm working on a project to connect esp32 to Azure event/iot hub using gloveboxes git project.
But I'm receiving this error (OSError: [Errno 12] ENOMEM ) on the line number 113
Link to this github repository is
https://github.com/gloveboxes/ESP32-Micropython-Azure-IoT-and-Event-Hub-Client

import iothub
import eventhub
import socket
import ussl
import utime as time
import network
from machine import I2C, Pin, ADC
import ssd1306 as oled
import gc
import config
import sensor_fake

# i2c = I2C(scl=Pin(4), sda=Pin(5))
i2c = I2C(scl=Pin(22), sda=Pin(21))
builtinLedPin = 5

display = None
builtinLed = None

cfg = config.Config('config.eventhub.json')
mySensor = cfg.sensor.Sensor(i2c)


if cfg.hubType == 'eventhub':
  hub = eventhub.EventHub(cfg.host, cfg.eventHubName, cfg.eventHubPolicyName, cfg.key)
elif cfg.hubType == 'iothub':
  hub = iothub.IotHub(cfg.host, cfg.deviceId, cfg.key)

wlan = network.WLAN(network.STA_IF)

lastUpdated = 0
updateSas = True


def newSasToken():
    global lastUpdated, updateSas, SAS
    if time.ticks_diff(time.time(), lastUpdated) > 60 * 15:
        lastUpdated = time.time()
        updateSas = True

    if updateSas:
        SAS = hub.generate_sas_token()
        print('Updating Sas')
        updateSas = False


def initDisplay(i2c):
    global display, builtinLed
    i2cDevices = I2C.scan(i2c)
    if 60 in i2cDevices:
        display = oled.SSD1306_I2C(128, 64, i2c)
        return True
    else:
        builtinLed = Pin(builtinLedPin, Pin.OUT)
        return False


def wlan_connect(ssid='MYSSID', password='MYPASS'):
    if not wlan.active() or not wlan.isconnected():
        wlan.active(True)
        print('connecting to:', ssid)
        wlan.connect(ssid, password)
        while not wlan.isconnected():
            pass
    print('network config:', wlan.ifconfig())


def checkwifi():
    blinkcnt = 0
    while not wlan.isconnected():
        time.sleep_ms(500)


def main(use_stream=True):

    s = socket.socket()
    ai = socket.getaddrinfo(cfg.host, 443)
    addr = ai[0][-1]
    s.close()

    count = 0
    errorCount = 0

    while True:
        if not oledDisplay:
            builtinLed.value(0)  # turn on led

        checkwifi()
        newSasToken()
        count = count + 1

        temperature, pressure, humidity = mySensor.measure()
        light = 0
        freeMemory = gc.mem_free()

        if oledDisplay:
            display.fill(0)
            display.text('t:' + str(temperature), 0, 0)
            display.text('p:' + str(pressure), 0, 9)
            display.text('h:' + str(humidity), 0, 18)
            display.text('m:' + str(freeMemory), 0, 27)
            display.text('c:' + str(count), 0, 36)
            display.text('d:' + cfg.deviceId, 0, 45)
            display.text('e:' + str(errorCount), 0, 53)
            display.show()

        data = b'{"DeviceId":"%s","Id":%u,"Mem":%u,"Celsius":%s,"hPa":%s,"Humidity":%s, "Geo":"%s", "Light":%d, "Errors":%d}' % (
            cfg.deviceId, count, freeMemory, temperature, pressure, humidity, cfg.location, light, errorCount)

        try:
            s = socket.socket()
            s.connect(addr)
            s = ussl.wrap_socket(s)  # SSL wrap

            # Send POST request to Azure IoT Hub
            # s.write("POST /devices/" + cfg.deviceId +
            #         "/messages/events?api-version=2016-02-03 HTTP/1.0\r\n")

            s.write("POST " + hub.endpoint + " HTTP/1.1\r\n")
            # HTTP Headers
            s.write("Host: " + cfg.host + "\r\n")
            s.write("Authorization: " + SAS + "\r\n")
            s.write("Content-Type: application/json\r\n")
            s.write("Connection: close\r\n")
            s.write("Content-Length: " + str(len(data)) + "\r\n\r\n")
            # Data
            s.write(data)

            # Print 128 bytes of response
            print(s.read(128)[:12])

            s.close()
        except:
            print('Problem posting data')
            errorCount = errorCount + 1
        finally:
            if not oledDisplay:
                builtinLed.value(1)  # turn off led

            print('messages sent: %d, errors: %d' % (count, errorCount))
            time.sleep(cfg.sampleRate)


oledDisplay = initDisplay(i2c)
if oledDisplay:
    display.text("welcome", 0, 0)
    display.show()

wlan_connect(cfg.wifiSsid, cfg.wifiPwd)

time.sleep(2)  # allow for a little settle time
main()

But I'm receiving this error (OSError: [Errno 12] ENOMEM ) on the line number 113

SSL connections take a lot of memory, and usually you can only have one open at a time.

What is the full output of the script when it runs into an error?

You should move the s.close() line from the end of the try: to the start of the finally:. That should help.

It prints "Messages sent: 12, errors:12 " and numbers incrementing. At start, I didn't know what is the actual error so I commented the try, extecpt and finally, so I got this error

this is the error that I'm receving

This is the actual code that I'm using

# if not oledDisplay:
        #     builtinLed.value(0)  # turn on led

        checkwifi()
        newSasToken()
        count = count + 1

        #temperature, pressure, humidity = mySensor.measure()
        temperature, pressure, humidity = (36, 67, 60)

        light = 0
        freeMemory = gc.mem_free()

        # if oledDisplay:
        #     display.fill(0)
        #     display.text('t:' + str(temperature), 0, 0)
        #     display.text('p:' + str(pressure), 0, 9)
        #     display.text('h:' + str(humidity), 0, 18)
        #     display.text('m:' + str(freeMemory), 0, 27)
        #     display.text('c:' + str(count), 0, 36)
        #     display.text('d:' + cfg.deviceId, 0, 45)
        #     display.text('e:' + str(errorCount), 0, 53)
        #     display.show()

        data = b'{"DeviceId":"%s","Id":%u,"Mem":%u,"Celsius":%s,"hPa":%s,"Humidity":%s, "Geo":"%s", "Light":%d, "Errors":%d}' % (
            cfg.deviceId, count, freeMemory, temperature, pressure, humidity, cfg.location, light, errorCount)

        #try:
        s = socket.socket()
        s.connect(addr)
        s = ussl.wrap_socket(s)  # SSL wrap

        # Send POST request to Azure IoT Hub
        # s.write("POST /devices/" + cfg.deviceId +
        #         "/messages/events?api-version=2016-02-03 HTTP/1.0\r\n")

        s.write("POST /devices/" + cfg.deviceId +"/messages/events?api-version=2018-06-30 HTTP/1.0\r\n")
        #s.write("POST " + hub.endpoint + " HTTP/1.1\r\n")
        # HTTP Headers
        s.write("Host: " + cfg.host + "\r\n")
        s.write("Authorization: " + SAS + "\r\n")
        s.write("Content-Type: application/json\r\n")
        s.write("Connection: close\r\n")
        s.write("Content-Length: " + str(len(data)) + "\r\n\r\n")
        # Data
        s.write(data)

        # Print 128 bytes of response
        print(s.read(128)[:12])

        s.close()
        #except:
        print('Problem posting data')
        errorCount = errorCount + 1
        #finally:
            # if not oledDisplay:
            #     builtinLed.value(1)  # turn off led

        print('messages sent: %d, errors: %d' % (count, errorCount))
        time.sleep(cfg.sampleRate)

I have tried your suggestion

You should move the s.close() line from the end of the try: to the start of the finally:. That should help

But getting the same thing

I'm experiencing the same issue. Getting ENOMEM at the line ussl.wrap_socket(s)
I'm not using Azure IOT, just making a simple HTTP get, with a tiny text file (over https).
Disappointing as everything these days is over HTTPS...

Also seeing this error intermittantly when calling ssl.wrap_socket()

Maybe its duplicated #7038 ?

Merge pull request micropython#5219 from tannewt/multiple_status_dots…

Is there any way to open just two simultaneous SSL connections? I want to keep one stream open indefinitely and also send some https requests intermittently without closing the original socket.

This issue is now being tracked in #8940.

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OSError: [Errno 12] ENOMEM ESP32-Micropython-Azure-Event-Hub-Client #5219

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OSError: [Errno 12] ENOMEM ESP32-Micropython-Azure-Event-Hub-Client #5219

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