ESP8266 Community Forum

- Sun Feb 15, 2015 3:28 am #9799 I've modified a transparent TCP Wifi-UART bridge to be able to upload sketches to arduinos. While it works, it's incredibly slow. It takes ~5 minutes to upload a 23KB sketch. The reason for the poor performance is the Wifi round-trip. It takes ~400ms to get any form of round-trip over Wifi and there are 2 round-trips per data block.

I tried siwtching to 160Mhz cpu clock but see no difference, maybe I didn't get that right. Does anyone know how to "tune" the Wifi? I'm configuring STA+AP and using STA with WPA/PSK, I wonder whether it might go faster if I turn AP off? Any experience?

- Sun Feb 15, 2015 4:15 am #9802 I think your main problem is esp firmware or your update method. Can you share your update method and firmware?

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- Sun Feb 15, 2015 4:58 am #9806 I see update method mentioned many times. What do you mean by "update method"and what that needs to be to be called "proper"?

On the topic:
UART blocking the response? And what do you mean by two transactions? PUSH-ACK or time between when you send the packet and your code responds that it is ready for the next? What baudrate are you using to upload to the ardiuno?

- Sun Feb 15, 2015 1:07 pm #9856 I'm using the SDK 0.9.5 with some custom code to create a transparent bridge between Wifi and UART. I'm building the firmware with the esp-open-sdk and uploading two bin files at 0x00000 and 0x40000. Not sure how there would affect round-trip times...

Two transactions: avrdude sends a "set address" command to the arduino and waits for an ACK, then it sends a "write page" command to write a flash block and waits for an ACK. So it takes two round-trips per flash block.