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OSError: [Errno 12] ENOMEM ESP32-Micropython-Azure-Event-Hub-Client #5219
Description
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()
Activity
dpgeorge commentedon Oct 16, 2019
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 thetry:to the start of thefinally:. That should help.arslan437 commentedon Oct 16, 2019
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
arslan437 commentedon Oct 16, 2019
this is the error that I'm receving
This is the actual code that I'm using
arslan437 commentedon Oct 16, 2019
I have tried your suggestion
But getting the same thing
DonJayamanne commentedon Nov 24, 2019
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...
enigmaniac commentedon Jan 24, 2021
Also seeing this error intermittantly when calling ssl.wrap_socket()
enesbcs commentedon May 14, 2021
Maybe its duplicated #7038 ?
Merge pull request micropython#5219 from tannewt/multiple_status_dots…
alexwohlbruck commentedon Mar 5, 2022
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.
jimmo commentedon Jul 21, 2022
This issue is now being tracked in #8940.