Faster Wifi Startup?

[semireg]

Coming from the ESP8266 I'm used to fast startup times where it seemed like the wifi connection was maintained between uPy soft reboots. When uploading to the WiPy (ESP32) it takes much longer for the wifi to start.

Is there a configuration option that allows wifi to be saved between soft reboots? Faster the better - less time waiting to test new code that relies on WiFi.

[misterlisty]

I find wifi connection fairly fast but i have found that on my netgear..it fails to connect for an unknown reason.

[livius]

@semireg
If you look into docs there is example

if machine.reset_cause() != machine.SOFT_RESET:
    wlan.init(mode=WLAN.STA)
    # configuration below MUST match your home router settings!!
    wlan.ifconfig(config=('192.168.178.107', '255.255.255.0', '192.168.178.1', '8.8.8.8'))

if not wlan.isconnected():
    # change the line below to match your network ssid, security and password
    wlan.connect('mywifi', auth=(WLAN.WPA2, 'mywifikey'), timeout=5000)
    while not wlan.isconnected():
        machine.idle() # save power while waiting

[robert-hh]

@semireg Like the example below, you can test at boot time whether the device is already connected (using wlan.isconnected()), and reconnect only if not. That works fine for me.

[semireg]

Thanks for the replies. I'm using both of these techniques but upon sync via Atom (Pymakr plugin) the wlan is no longer connected.

>>>
Uploading project (src)...
Reading file status
[1/1] Writing file main.py
Upload done, resetting board...
ets Jun  8 2016 00:22:57

rst:0x7 (TG0WDT_SYS_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff9028,len:8
load:0x3fff9030,len:1060
load:0x4009fa00,len:0
ho 12 tail 0 room 4
load:0x4009fa00,len:15072
entry 0x400a063c
Starting
WLAN Not Connected

[ssmith]

@livius said in Faster Wifi Startup?:

@semireg
If you look into docs there is example

if machine.reset_cause() != machine.SOFT_RESET:
    wlan.init(mode=WLAN.STA)
    # configuration below MUST match your home router settings!!
    wlan.ifconfig(config=('192.168.178.107', '255.255.255.0', '192.168.178.1', '8.8.8.8'))

if not wlan.isconnected():
    # change the line below to match your network ssid, security and password
    wlan.connect('mywifi', auth=(WLAN.WPA2, 'mywifikey'), timeout=5000)
    while not wlan.isconnected():
        machine.idle() # save power while waiting

Doesn't the while loop freeze the board if the WiFi doesn't connect?

[semireg]

@ssmith, yes, but that's true with any contrived example.

[livius]

@ssmith
yes, but this is only example.
i self use different code

wasTimeout = 0
chrono = Timer.Chrono()
		chrono.start()
		while not wlan.isconnected():
			machine.idle()
			if chrono.read()>30: #30 sedcond timeout
                                wasTimeout = 1
				break

but as discussed somewhere on the forum, this is only "missed timeout feature".
It should be passed to connect.

[semireg]

@livius Thanks for the Chrono snippet. I'm always glad to find these nicely packaged design patterns.