Short: I do not like the developing environment provided by Espressif. Then I rewrite Makefile to:

• reuse common code, e.g. MQTT, flash file system, and driver for SoC peripherals.
• have other json parsing. Current json parsing of SDK (take from Contiki OS) is not good enough, I have no way to check if this/that string is a valid JSON.
• quick setup, e.g. make, make flash, make login, make OTA=1 fash.
• make firmware over-the-air update easy, e.g. make RELEASE=MINOR/MINOR/PATCH. This is the on going process.

All examples have been testing with 512KB module, SDK 1.0.0.

Use with SDK v1.0.0, setup with esp-open-sdk. With location of esp-open-sdk, change ESPRESSIF_ROOT in Makefile.common to point to this SDK. We will use lib, include, ld codes/scripts from SDK, ah, together with compiling tools off-course.

I have testing only with 512KB module. >1MB flash will be tested and update later.

To use OTA update firmware with 512KB, change linker file ld/eagle.app.v6.new.512.app1/2.ld, section irom0_0_seg to have more spaces.

<  irom0_0_seg :                         org = 0x40241010, len = 0x2B000
---
>  irom0_0_seg :                         org = 0x40201010, len = 0x31000

I update tools/gen_appbin.py to avoid compiling error. Off-course I can change $PATH of shell to avoid touching this Python script.

<         cmd = 'xtensa-lx106-elf-nm -g ' + elf_file + ' > eagle.app.sym'
---
>         cmd = '~/esp-open-sdk/xtensa-lx106-elf/bin/xtensa-lx106-elf-nm -g ' + elf_file + ' > eagle.app.sym'

make OTA=1/0                # default OTA=1
make OTA=1 IMAGE=1/2        # generate image user1/user2
make OTA=1 IMAGE=1/2 flash  # program with OTA enable

Declare ROOT, this is the root of the project, from which could access apps and Makefile.common

Example of Makefile for program under /examples:

ROOT = ../..
APPS += mqtt
include ${ROOT}/Makefile.common

Please (me), check for frequence update

• mqtt https://github.com/tuanpmt/esp_mqtt
• json parsing https://bitbucket.org/zserge/jsmn
• flash file system https://github.com/pellepl/spiffs

• more complete ota update program, API of ota-update is at docs/ota-update.md
• flash file system testing