Cheap WiFi modules

[Charlie]

FYI for those of us that remember teletype which required a CR & LF in any order, these devices do not work that way.
You MUST send CR LF (10,13) in the correct order to work consistently. 10,13 will *sometimes* work, but not always.

[richard]

according to the http://www.electrodragon.com/w/Wi07c web site since firmware 0.92 the terminator is \r\n previously was \n\r.
\r\n has worked for all my ebay supplied esp2866's but the firmware needed updating for a decent result to be achievable
ps
cr=13=\r
lf=10=\n

[Jumper]

I have what might be a really stupid question.

Is it possible (and if it is then how) to send serial data from one wifi module to an other when they are both connected to the same wifi router?

I would like to remove some cables in a rs-485 network and replace then with uart wifi solution. I just dont know where to start.... well I have a wifi router :-) and the modules and lots of PICs and programmers . Does anyone know?

[richard]

Is it possible (and if it is then how) to send serial data from one wifi module to an other when they are both connected to the same wifi router?

you may not even need a router the esp modules can also act a access point . I have not tried that sort of comms yet but there are examples around on the web using TCP/UDP packets , or you could try TELNET mode . I think telnet is the closest match to what you want

[Jumper]

True, but I need to assign an IP to the module and I can not see any AT command for that ... and I really would like to have static IP so each module always had the same number even when the system is re-booted.

How else do we know who is on the other end of the net?

[richard]

if you do a AT+CIFSR you get two ip addresses the first is the modules ap address the second the dhcp address from your router , question is the first ip address identical on all modules ,maybe they can network that way. " silicon chip" magazine had an article on using these modules as ap's and assigning addresses to other devices using that ap , but I can find no mention of assigning the ap address anywhere . maybe you do need a router , most routers allow permanent address assignments/reservations (usually nested about ten levels deep in some arcane menu structure) .

[gunayburak]

if you do a AT+CIFSR you get two ip addresses the first is the modules ap address the second the dhcp address from your router , question is the first ip address identical on all modules ,maybe they can network that way. " silicon chip" magazine had an article on using these modules as ap's and assigning addresses to other devices using that ap , but I can find no mention of assigning the ap address anywhere . maybe you do need a router , most routers allow permanent address assignments/reservations (usually nested about ten levels deep in some arcane menu structure) .

Hello Richard ...

How did you figure out the pending client problem ... For example if a scenario occurs as follows ; First client connects to the server then the second one connects but its +IPD data will be missed while answering to the first client ... So will its channel number ... Do you have a solution for that ? Or perhaps there is an AT command I can't see that helps us to display the numbers of the channel IDs of the incoming and pending client requests ....

[Charlie]

FYI for those of us that remember teletype which required a CR & LF in any order, these devices do not work that way.
You MUST send CR LF (10,13) in the correct order to work consistently. 13,10 will *sometimes* work, but not always.

Nothing worse than discovering a critical typo after the time to edit has expired. I've corrected it in the quote. Bottom line, use 10,13 in that order.

[Ioannis]

I think this site might be interesting for the IoT:

https://thingspeak.com/

After registration you get a free channel for your data to be stored, graphed or used as you want.

Ioannis

[ardhuru]

True. People have done amazing things with the ESP8266, and uploading to Thingspeak. Also absolves you from having to learn HTML, I guess.

For those yet to discover these, there have been a slew of development utilities for the ESP8266.

And, folks have ported LUA (remember CHDK for Canon point-and-shoots?!), a scripting language to the ESP. The benefit being to be able to use the microcontroller on the module directly to store and execute simple programs. And with its own IO, one wouldnt even need a pic for simple applications.

My favourites are ESPLORER (multi-purpose, works with stock firmware and LUA) and LuaLoader (only for LUA).

Regards,

Anand

[dhouston]

These are available from Amazon (some via Prime with free shipping) for about $8. Now, to see if I can talk some dialect of Basic to them.

[rsocor01]

I bought 5 of these modules for $13.45 plus $2.25 shipping on ebay. I can't wait to start playing with these modules.

[ardhuru]

Greetings, Dave!

There is indeed a basic-of-sorts, a scripting language called LUA thats already been ported to the ESP8266.

Makes things much easier, and other folks have developed IDEs to be able to upload/load LUA files directly on the module.

In fact LUA is getting so popular, they have a separate sub-form for LUA at www.esp8266.com

If this generates more interest, I'll post all the LUA related URLs in my record.

Regards,

Anand