MQTT Topic depth? about espduino

[ymaglaras]

I had a similar problem with very long topics (i.e. /home/firstfloor/livingroom/windows/left/down etc.), especially when I had many of them (states/commands/sensors, so on). At first I tried shortening the topics, but I still had problems. Apparently you might have lots of SRAM when compiling, but when your program runs on the Arduino, it consumes more SRAM than that and runs out of memory, causing all sorts of problems.

So I decided to put everything in PROGMEM like so:

const char PROGMEM superLongTopic[] = "/super/long/topic/that/goes/on/and/on/and/on/and/on";
(add a bunch of those)

and then you need some function to bring them back from PROGMEM:

#define MAX_STRING 65 //your longest possible topic. Careful, this is actually consuming SRAM
char stringBuffer[MAX_STRING];
char* getString(const char* str) {
strcpy_P(stringBuffer, (char*)str);
return stringBuffer;
}

So, when you need your topic, you call getString(superLongTopic)

[ibrahimisim]

Hello,

When I upload software to esp8266 I get an error that is below. Please help me !!!.

pi@raspberrypi /usr/share/arduino/libraries/espduino $ sudo esp8266/tools/esptool.py -p /dev/ttyUSB0 write_flash 0x00000 esp8266/release/0x00000.bin 0x40000 esp8266/release/0x40000.bin
Could not find platform dependent libraries
Consider setting $PYTHONHOME to [:]
Traceback (most recent call last):
File "esp8266/tools/esptool.py", line 22, in
import serial
ImportError: No module named serial

[Turael]

Hey ymaglaras,

thanks for your response and you're right. I tried your snippet and it works :)
I still need to learn alot about the arduino first I think...

So my problem is not a ESPduino problem but my (arduino) problem... :)

Edit:

Well i think that isnt my problem...
I checked my free memory with MemoryFree library
http://playground.arduino.cc/Code/AvailableMemory
and after I cleaned my code I've got 886bytes free - perhaps thats not enough?
I still able to sent / receive only 13 bytes =/