Difference: InternetAccess (3 vs. 4)

Revision 42020-06-01 - UliRaich

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Internet access

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Before doing anything on the Internet we must first connect the ESP32 to the WiFi network. The module:

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https://iotworkshop.africa/pub/IoT_Course_English/InternetAccess/wifi_connect.py.txt

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https://iotworkshop.africa/pub/IoT_Course_English/InternetAccess/wifi_connect_public.py.txt

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provides all necessary functions to do this. It first connects to WiFi as a station interface and print the IP address it is connected to. If it is already connected it simply returns. Once connected it gets the current time from the NTP time server and sets up the ESP32 real time clock. You can get the current GMT time with gmtTime() or CET time with cetTime().

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which corresponds to the 7th of May 2020 at 9:44:33 GMT.

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You can also get the current date and time in a more readable format with dateString(currentTime), where currentTime is the tuple returned by gmtTime() or cetTime()

Since I cannot know the SSID and password of your WiFi network, connect() will only work for my private network. You can however pass your SSID and password as parameters:
connect(ssid="YourSSID",password="YourWiFiPasswword")

You can get the IP address allocate with

getIPAddress().

An FTP server

When collecting data it may be interesting to transfer them for analysis to a PC. For this an FTP server is very helpful and there is one included in the MicroPython binary. Make sure you are connected to the network with wifi_connect and then simply
import uftpd. You may stop the server again with uftpd.stop().

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META FILEATTACHMENT	attachment="wifi_connect.png" attr="" comment="" date="1588844762" name="wifi_connect.png" path="wifi_connect.png" size="31594" user="UliRaich" version="1"

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META FILEATTACHMENT	attachment="dateString.png" attr="" comment="" date="1591014614" name="dateString.png" path="dateString.png" size="21043" user="UliRaich" version="1"
META FILEATTACHMENT	attachment="wifi_connect_public.py.txt" attr="" comment="" date="1591015096" name="wifi_connect_public.py.txt" path="wifi_connect_public.py.txt" size="3250" user="UliRaich" version="1"

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