Connect and send data via WiFi from WiPy to LoPy
Regarding the problems we found to do the same by BLE (https://forum.pycom.io/topic/1282/send-data-from-wipy-to-lopy-with-ble/6), I' m asking if it is possible to send data via WiFi from WiPy to LoPy.
Reading the documentation, it seems easy to connect, and then create a socket, but I prefer to ask you if it is possible before wasting my time...
for server node it is not good to have
while not wlan.isconnected(): time.sleep_ms(50)
You do not connect wifi here only you start Access Point (AP) - look if it start on network list scan on client node side or your PC
Update: It's not connecting really, I thought that it was printing the ifcongif but it's not. This is what it prints:
@robert-hh thank you Robert. The connection is set correctly, now let's try to send data.
WiPy (Client - STA mode, transmitter):
# WiPy sends data -> Client -> WLAN mode = STA import network import time import pycom # setup as a station wlan = network.WLAN(mode=network.WLAN.STA) wlan.connect('lopy-wlan', auth=(network.WLAN.WPA2, 'www.pycom.io')) while not wlan.isconnected(): time.sleep_ms(50) print(wlan.ifconfig()) pycom.rgbled(0x007f00) # green # now use socket as usual ...
LoPy (Server - AP mode, listener):
import network import time from network import WLAN # setup as a station wlan = network.WLAN(mode=network.WLAN.AP) wlan.init(mode=WLAN.AP, ssid='lopy-wlan', auth=(WLAN.WPA2,'www.lopy.io'), channel=7, antenna=WLAN.INT_ANT) #wlan.connect('your-ssid', auth=(network.WLAN.WPA2, 'your-key')) while not wlan.isconnected(): time.sleep_ms(50) print(wlan.ifconfig())
@amartinez The access point has to set an IP address. By default this is 192.168.4.1. The AP will also run an DHCP server, which distributes IP-addresses to the client. The Client has to connect to the AP.
It might be confusing that there are two layers of connection needed:
- One at the link level - Access point to Station (this is like plugging in a cable)
- One at the socket level - Client to server
@livius So, the server will be the listener (LoPy) and the Client sends the data (WiPy)?
It's a bit confusing because on BLE its the contrary...
In order to listen, have I to set an IP adress?
you can use
in "server node" AP
in "client" node STA
@livius thank you. Could you share any code to step on? Or any recommendations about the necessary code?
What WLAN mode have I to choose? And what about the network security?
I guess the connection is done similar than the example:
import network import time # setup as a station wlan = network.WLAN(mode=network.WLAN.STA) wlan.connect('your-ssid', auth=(network.WLAN.WPA2, 'your-key')) while not wlan.isconnected(): time.sleep_ms(50) print(wlan.ifconfig()) # now use socket as usual ...
And then, how do I send the data?
Yes, it is possible
But i tested this with 2xWipy2 without lopy
But it should work same.