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esp8266@esp8266-VirtualBox:~/vishal/esp82XX-basic$ make burn

/home/esp8266/vishal/esp-open-sdk/xtensa-lx106-elf/bin/xtensa-lx106-elf-gcc -mlongcalls -Os -I/home/esp8266/vishal/esp-open-sdk/sdk/include -Iesp82xx/include -I. -Iesp82xx/fwsrc -Iuser -DICACHE_FLASH -DWEB_PORT=80 -DCOM_PORT=7777 -DBACKEND_PORT=7878 -DSLOWTICK_MS=50 -DVERSSTR='"Version: v0.1-7-g06742-dev - Build 2017年 01月 03日 星期二 02:49:57 CST with -DICACHE_FLASH -DWEB_PORT=80 -DCOM_PORT=7777 -DBACKEND_PORT=7878 -DSLOWTICK_MS=50"' esp82xx/fwsrc/uart.c esp82xx/fwsrc/esp82xxutil.c esp82xx/fwsrc/flash_rewriter.c esp82xx/fwsrc/http.c esp82xx/fwsrc/commonservices.c esp82xx/fwsrc/http_custom.c esp82xx/fwsrc/mdns.c esp82xx/fwsrc/mfs.c user/custom_commands.c user/user_main.c -flto -Wl,--relax -Wl,--gc-sections -nostdlib -L/home/esp8266/vishal/esp-open-sdk/sdk/lib -L/home/esp8266/vishal/esp-open-sdk/xtensa-lx106-elf/lib/gcc/xtensa-lx106-elf/4.8.5/libgcc.a /home/esp8266/vishal/esp-open-sdk/sdk/lib/libmain.a /home/esp8266/vishal/esp-open-sdk/sdk/lib/liblwip.a /home/esp8266/vishal/esp-open-sdk/sdk/lib/libssl.a /home/esp8266/vishal/esp-open-sdk/sdk/lib/libupgrade.a /home/esp8266/vishal/esp-open-sdk/sdk/lib/libnet80211.a /home/esp8266/vishal/esp-open-sdk/sdk/lib/libwpa.a /home/esp8266/vishal/esp-open-sdk/sdk/lib/libphy.a /home/esp8266/vishal/esp-open-sdk/sdk/lib/liblwip.a /home/esp8266/vishal/esp-open-sdk/sdk/lib/libcrypto.a /home/esp8266/vishal/esp-open-sdk/sdk/lib/libpp.a /home/esp8266/vishal/esp-open-sdk/xtensa-lx106-elf/lib/gcc/xtensa-lx106-elf/4.8.5/libgcc.a -T /home/esp8266/vishal/esp-open-sdk/sdk/ld/eagle.app.v6.ld -B/home/esp8266/vishal/esp-open-sdk/sdk/lib -o image.elf
/tmp/cctpsX1W.ltrans1.ltrans.o:(.irom0.literal+0x34): undefined reference to wifi_set_raw_recv_cb' /tmp/cctpsX1W.ltrans1.ltrans.o: In function myTimer$2546':
:(.irom0.text+0x45): undefined reference to `wifi_set_raw_recv_cb'
collect2: error: ld returned 1 exit status
make: *** [image.elf] Error 1

wifi_set_raw_recv_cb( rx_func ); //function call

void attribute ((noinline)) rx_func( struct RxPacket * r, void ** v ) //defination

Hi,
how should i make setup at router side. Actually executable toprecorder and process made but i don't know how to made setup at router side.

After "make burn" and "make netburn" it creates its own WiFi Access Point but i am new to esp8266 i don't know how to move forward to get packets.

Thanks.

Hey. I forked this project in attempt to alter it into a RToF project here.
I had some success, but results still deviate ~100 CC's (20 000 packets gathered). I think the biggest delay happens on ESP "bouncer" (receive packet -> send it back routine). Could this routine be improved by writing a custom NMI? Or is sending a packet too long of a process for NMI? Maybe I could set a value with custom nmi and then send a packet on hardware timer if this value is set?

I know that this is several years old now, but I'm interested in experimenting with this. I followed this tutorial to get my setup working. Its basically pfalcons environment, but with a couple patches to help with a couple things. In order to get this recieve callback thing to work I need to use the sdk mentioned here. I tried make STANDALONE=n, as described in the readme for pfalcons environment, and to modify the make file:

CC=xtensa-lx106-elf-gcc -I$(DIR)/include -L$(DIR)/lib

LDLIBS=-nostdlib -Wl,-Map=output.map -Wl,--start-group -lc -lhal -lpp -llwip -lphy -lnet80211 -lwpa -lmain -Wl,--end-group -lgcc

CFLAGS= -I. -mlongcalls

LDFLAGS=-T$(DIR)/ld/eagle.app.v6.ld

where DIR is the path to the sdk. This worked when I set DIR to the file "ESP8266_NONOS_SDK-2.1.0-18-g61248df", that you get when you make in pfalcons environment, but when I try to set DIR to the sdk with angus patch, it returns with this

xtensa-lx106-elf-gcc -I/media/lysander/Data/Workspace/ESP8266/ESP8266_NONOS_SDK/include -L/media/lysander/Data/Workspace/ESP8266/ESP8266_NONOS_SDK/lib -T/media/lysander/Data/Workspace/ESP8266/ESP8266_NONOS_SDK/ld/eagle.app.v6.ld main.o -nostdlib -Wl,-Map=output.map -Wl,--start-group -lc -lhal -lpp -llwip -lphy -lnet80211 -lwpa -lmain -Wl,--end-group -lgcc -o main /media/lysander/Data/Workspace/ESP8266/ESP8266_NONOS_SDK/lib/libmain.a(app_main.o): In function 'user_uart_wait_tx_fifo_empty': (.irom0.text+0x6e0): undefined reference to 'user_rf_cal_sector_set' /media/lysander/Data/Workspace/ESP8266/ESP8266_NONOS_SDK/lib/libmain.a(app_main.o): In function 'flash_data_check': (.irom0.text+0x84b): undefined reference to 'user_rf_cal_sector_set' /media/lysander/Data/Workspace/ESP8266/ESP8266_NONOS_SDK/lib/libwpa.a(wpa_auth.o): In function 'wpa_receive': (.irom0.text+0x9a0): undefined reference to 'aes_wrap' /media/lysander/Data/Workspace/ESP8266/ESP8266_NONOS_SDK/lib/libwpa.a(wpa_auth.o): In function '__wpa_send_eapol': (.irom0.text+0xd73): undefined reference to 'aes_wrap' collect2: error: ld returned 1 exit status <builtin>: recipe for target 'main' failed make: *** [main] Error 1

I don't really know what to do from here, any help would be appreciated, thanks.

Hi @cnlohr ,

What should be the opmode? (i think so opmode=2 for access point for this program)

   **i have some doubts..**

in user_main.c at line 224--> if( !did_init && printed_ip ) printed ip not becomes 1 so it's not going inside loop. So when i'm using--> if( !did_init) i'm getting packages. see image i'm not using printed ip here.

also when i just added some printf(); function to check MAC addresses esp12e getting reset
rst cause:2, boot mode:(3,6).

Also at toprecorder i hardcoded ip address to 192.168.1.113 and when i run the program i'm not getting data..but my ESP's getting packets.

Thanks.

Hey CnLohr
After discovering send_pkt_freedom can no longer send deauth packets / any other mgmt frames, I thought about using your RawSendBuffer (this should work, right?) but I cannot get it to work.
ppTxPkt and ppRegisterTxCallback are undeclared. Since I can see them in libnet80211/ieee80211.o, adding the declarations "extern ...." should be enough, right? I tried for quite a bit, but failed miserably, and cannot find them anywhere in your code either... Any idea?
Thanks :)

Hello, cnlohr,
Great project!

For surveillance of crop irrigation systems,
I am looking for a 1D-distance in the range up to 350 m, with ~10m accuracy.
I think this is feasible with wlan directional antennae.

From an earlier google scan, I kept this link (in German only):
https://chemnitzer.linux-tage.de/2011/vortraege/folien/653_haustein.pdf
According to them, the RTS-CTS-NULL-ACK sequence is part of IEE 802.11 standard and travels 4 time the transmit line with little jitter.
They use a linux MAC80211 driver, which obviously allows the required manipulations.
They report 1 µs, but by repeating measurements (n >> 1000), they end up at ns resolution.

For my 10m accuracy target, we'd need ~ 100 ns for quadruple path.
Their setup is a master sender/receiver at a fixed location, a slave receiver close to it, and the target receiver at the moving distant target. I think a raspberry or so might be a good master, and esp8266 suitable slaves.

How does this approach fit into the work you have done till now?
Would you like to share efforts?

Wolfgang Rosner

Copied from Youtube comment:
I took toprecorder/data10.txt data and looked specifically at offset and frequency differences between all the clocks:

Using .241's broadcasts as the "master" clock:

• .179 is running 0.316ppm slower
• .147 is running 2.218ppm slower
• .169 is running 13.519ppm slower and jumped by 508.763 microseconds somewhere between .241's pktids 9254 and 9255
• .213 is running 7.877ppm slower and jumped by 508.513 microseconds somewhere between .241's pktids 10715 and 10716

Removing the average frequency differences and the two clock jumps, I get this graph, which shows the clock wander: https://dan.drown.org/clocks/data10.png

Maybe trying to insulate the esp8266's from any airflow would lower their temperature changes, which should lower their clock wander.

Also, maybe using a PID control loop on each node would work to sync the frequencies. This is what I've done with NTP on the esp8266 along those lines: https://github.com/ddrown/Arduino_ClockPID

NTP uses round trip time to try to eliminate the phase offset due to one way latency. I'm not sure that would be needed for this application. Knowing the distances between the fixed points should make it possible to cancel out those terms in the equation.

Lastly, the rx and tx timestamp accuracy will add errors as well, but I haven't measured how accurate they are.

HI,
I'm using ESP12-E when i tried to "make burn" cmd i'm getting following error:

/home/esp8266/vishal/esp-open-sdk/xtensa-lx106-elf/lib/gcc/xtensa-lx106-elf/4.8.5/../../../../xtensa-lx106-elf/bin/ld: image.elf section .text' will not fit in region iram1_0_seg'
/home/esp8266/vishal/esp-open-sdk/xtensa-lx106-elf/lib/gcc/xtensa-lx106-elf/4.8.5/../../../../xtensa-lx106-elf/bin/ld: region `iram1_0_seg' overflowed by 224 bytes
collect2: error: ld returned 1 exit status

so how i fix this issue?

Thanks

Hi, this is not really an "issue", but I just saw your work on trying to get the ESP8266 to do some raw ieee82011 packet processing. As it turns out, I've been working on this for some time as well. It would be interesting for all those who have this same goal to keep in touch and show updates on their progress.

Use the following SDK from Espressif, based off of 2.0 for use with this project.

Please note that this uses the standard espressif freedom API for sending, so nothing special.

REDUCED_ESP8266_NONOS_SDK_2.0.0_20160810_with_angus_patch.zip