Sending sketch to Atmega8 with optiboot via ESP01

[Petre84]

I'm trying to send the sketch to atmega8 with optiboot.
Source of otpiboot: https://code.google.com/p/optiboot/downloads/list (optiboot-v5.0a.zip )
uC is 8MHz (internal quartz).
Sketch is basic blink sketch from arduino ide (link to file : https://www.dropbox.com/s/xreb6mdbw6w3rnh/blink.hex?dl=0).
Card is ESP-01 (512kb) flashed with esp-link 1.0.4. Pin assignment : esp-01(AVR).

I've switched the baudrate to 9600 with command: http://192.168.2.107/console/baud?rate=9600

Scheme:

I try to upload the sketch from UBUNTU with command

petre@LinuxPC:~/arduino/arduino-1.6.5-r5$ hardware/tools/avr/bin/avrdude -C hardware/tools    /avr/etc/avrdude.conf -DV -patmega8 -Pnet:192.168.2.107:23 -carduino -b9600 -U flash:w:blink.hex:i -v -v -v

avrdude: Version 6.0.1, compiled on Apr 14 2015 at 18:03:40
     Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
     Copyright (c) 2007-2009 Joerg Wunsch

     System wide configuration file is "hardware/tools/avr/etc/avrdude.conf"
     User configuration file is "/home/petre/.avrduderc"
     User configuration file does not exist or is not a regular file, skipping

     Using Port                    : net:192.168.2.107:23
     Using Programmer              : arduino
     Overriding Baud Rate          : 9600
ioctl("TIOCMGET"): Inappropriate ioctl for device
ioctl("TIOCMGET"): Inappropriate ioctl for device
avrdude: ser_recv(): programmer is not responding
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0xff
avrdude: ser_recv(): programmer is not responding
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0xff
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0xff
avrdude: ser_recv(): programmer is not responding
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0xff
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0xff
avrdude: ser_recv(): programmer is not responding
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0xff
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0xff
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0xe7
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0xfd
ioctl("TIOCMGET"): Inappropriate ioctl for device

avrdude done.  Thank you.

If I change the baudrate to 115200 the result is:

petre@LinuxPC:~/arduino/arduino-1.6.5-r5$ hardware/tools/avr/bin/avrdude -C hardware/tools/avr/etc/avrdude.conf -DV -patmega8 -Pnet:192.168.2.107:23 -carduino -b115200 -U flash:w:blink.hex:i -v -v -v

avrdude: Version 6.0.1, compiled on Apr 14 2015 at 18:03:40
     Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
     Copyright (c) 2007-2009 Joerg Wunsch

     System wide configuration file is "hardware/tools/avr/etc/avrdude.conf"
     User configuration file is "/home/petre/.avrduderc"
     User configuration file does not exist or is not a regular file, skipping

     Using Port                    : net:192.168.2.107:23
     Using Programmer              : arduino
     Overriding Baud Rate          : 115200
ioctl("TIOCMGET"): Inappropriate ioctl for device
ioctl("TIOCMGET"): Inappropriate ioctl for device
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x41
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x54
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x2b
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x43
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x49
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x50
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x4d
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x55
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x58
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x3d
ioctl("TIOCMGET"): Inappropriate ioctl for device

avrdude done.  Thank you.

The uC resets on start (after ioctl("TIOCMGET"): Inappropriate ioctl for device) and second reset is after ioctl("TIOCMGET"): Inappropriate ioctl for device.

I've connected Esp TX to uC RX directly too but without changes.

[tve]

So the 9600 baud version tells me "wrong baud rate"
In the 115200 baud rate version, if you pull up an ascii chart and decode what avrdude received you see "AT+CIPMUX=", which tells me that whatever is loaded in the AVR processor started, i.e., the bootloader popped out of programming mode.
My guess is that the round-trip time is too large. This was a common occurrence for me when using an esp-01 or esp-03 due to the shitty RF design and went away once I switched to esp-12 modules.
We're working on adding code to esp-link to try and work-around this issue, but there's only so much we can do.

[tve]

I expect this to be fixed in V2.1 using the built-in AVR programmer. Please re-open if not and thank you for the report!