I’m using a Pycom GPy, and the SIM typically connects to AT&T in my location. I can send data from the GPy to the cloud, but I can’t send data from the cloud to the device.
This is the Python code that opens a socket, waits for a connection, and prints what it sent.
s = socket.socket()
s.settimeout(120)
s.bind(('',4010))
s.listen(5)
print ("Waiting for accept")
(conn, addr) = s.accept()
print("Connected", addr)
with conn:
data = conn.read()
print(data)
I have the LTE connection working in other code.
Whenever I try to send a message from the Dashboard (via TCP on port 4010), a message saying “Socket error: timed out” comes back. Earlier this morning, it was taking around 15-20 seconds for the error to appear in the log, but now it’s almost instantaneous.
Full code:
import socket
import ssl
import time
import errno
import pycom
import micropython
from network import LTE
import sys
import json
import binascii
from machine import RTC
pycom.heartbeat(False)
lte = LTE()
lte.attach()
while not lte.isattached():
pycom.rgbled(0xFF0000)
time.sleep(0.25)
pycom.rgbled(0)
time.sleep(0.25)
lte.connect() # start a data session and obtain an IP address
print("Waiting for connection")
while not lte.isconnected():
pycom.rgbled(0x00FF00)
time.sleep(0.25)
pycom.rgbled(0)
time.sleep(0.25)
print('Connected') # attach the cellular modem to a base station
try:
s = socket.socket()
s.settimeout(120)
s.bind(('',4010))
s.listen(5)
print ("Waiting for accept")
(conn, addr) = s.accept()
print("Connected", addr)
with conn:
data = conn.read()
print(data)
finally:
s.close()
lte.disconnect()
lte.dettach()