每月封存: 五月 2018

curl Alexa

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簡單來說就是

每個跟AVS(Amazon Voice Service ) 互動的裝置都需要先註冊在AVS

然後用註冊的資料(product ID)取得 user_code , token

接著就可以用 token 發給 AVS 詢問一些簡單的問題

也就是所謂的general question.

例如 What time is it? Tell me a joke. Wikipedia Hong Kong

如果你登入的帳號有開發AVS skill 的話那就可以自訂問題以及自訂回應問題的方法

例如發email 或者送API request 到自己的其他服務

 

取得 user_code 的方法

curl \
--data-urlencode "response_type=device_code" \
--data-urlencode "client_id=amzn1.application-oa2-client.75ecd91677d949f8b473891703fe167b" \
--data-urlencode "scope=alexa:all" \
--data-urlencode "scope_data={\
\"alexa:all\":{\
\"productID\":\"owendock\",\
\"productInstanceAttributes\":{\
\"deviceSerialNumber\":\"12345\"\
}\
}\
}" \
-H "Content-Type: application/x-www-form-urlencoded" -X POST https://api.amazon.com/auth/O2/create/codepair

然後把user code 輸入 https://amazon.com/a/code 進行登入

上面這個是你的裝置沒有瀏覽界面以及輸入裝置的時候的登入方法

官方手冊上面有app, site 最後才是 code-base 的登入方法

本篇所有API 都在 code-base 這邊可以找到說明

 

取得 token 的方法

登入完成之後就可以用下面 API 取得 token，沒有登入之前嘗試取得 token 會失敗

curl \
--data-urlencode "grant_type=device_code" \
--data-urlencode "device_code=2cfdfd43-4b11-4469-8304-10e38db41d1c" \
--data-urlencode "user_code=FBNJZN" \
-H "Content-Type: application/x-www-form-urlencoded" -X POST https://api.amazon.com/auth/O2/token

沒有登入或者登入失敗會看到下面的錯誤訊息

{"error_description":"The code pair has not been authorized","error":"authorization_pending"}

{"error_description":"The code pair is invalid. Please restart the code pair workflow","error":"invalid_code_pair"}

token 快要過期之前要自己主動refresh token，其實 token 拿到之後立刻refresh token 也不錯回報錯誤，也是拿的到 new token

curl \
--data-urlencode "grant_type=refresh_token" \
--data-urlencode "refresh_token=$AT" \
--data-urlencode "client_id=amzn1.application-oa2-client.75ecd91677d949f8b473891703fe167b" \
-H "Content-Type: application/x-www-form-urlencoded" -X POST https://api.amazon.com/auth/O2/token

拿到 token 之後就可以對 AVS 進行互動

下面是 speechrecognizer 的一個測試 refer here

curl -i --trace-ascii z.out \
-o test1.mp3 \
-H "Authorization: Bearer ${AT}" \
-F "metadata=<test.json;type=application/json; charset=UTF-8" \
-F "audio=<test.wav;type=audio/L16; rate=16000; channels=1" \
"https://access-alexa-na.amazon.com/v1/avs/speechrecognizer/recognize"

聲音檔案規格如下


All captured audio sent to AVS should be encoded as:

16bit Linear PCM
16kHz sample rate
Single channel
Little endian byte order

test.wav 音檔下載

https://drive.google.com/open?id=1Zt64oUm0xFQfEFkbVnK9Ig7ahAs2vFNf

cross compile bash for openWRT on Rasp Pi 3

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refer https://openwrt.org/docs/guide-developer/crosscompile

openWRT source 編譯的時候可以順便編譯出cross compile tool chain

  1. git clone https://git.lede-project.org/source.git
  2. cd source
  3. make menuconfig
  4. enter target system, select BCM27xx
  5. enter subtarget, select BCM2710
  6. check and enter Advanced configuration options (for developers)
    1. check Target Options
    2. check Toolchain Options
    3. keep default in above 2 options
  7. make -j8

以上編譯完成之後會出現 staging_dir/ 這個資料夾

staging_dir/ 資料夾裡面會有四個資料夾

host
packages
target-arm_cortex-a53+neon-vfpv4_musl-1.1.16_eabi
toolchain-arm_cortex-a53+neon-vfpv4_gcc-5.4.0_musl-1.1.16_eabi

toolchain 就是第四個資料夾了

接著寫個script (~/crosscompile/env.sh)方便設定cross compile 環境變數

export STAGING_DIR=/data2/owenwen/crosscompile/source/staging_dir
export TOOLCHAIN_DIR=$STAGING_DIR/toolchain-arm_cortex-a53+neon-vfpv4_gcc-5.4.0_musl-1.1.16_eabi
export LDCFLAGS=$TOOLCHAIN_DIR/usr/lib
export LD_LIBRARY_PATH=$TOOLCHAIN_DIR/usr/lib
export PATH=$TOOLCHAIN_DIR/bin:$PATH

然後下載 bash source , configure 的部份

  1. wget https://ftp.gnu.org/gnu/bash/bash-4.4.tar.gz
  2. tar zxf bash-4.4.tar.gz
  3. cd bash-4.4
  4. source ~/crosscompile/env.sh
  5. ./configure –build=i686-linux –host=armv7-linux CC=$TOOLCHAIN_DIR/bin/arm-openwrt-linux-gcc CXX=$TOOLCHAIN_DIR/bin/arm-openwrt-linux-g++ –without-bash-malloc
  6. make -j8

build pass 之後就會有一個可以在 openWRT on Rasp PI 3 上面運行的bash 囉！

在沒有加 –without-bash-malloc 之前，運行bash 會看到下面這個錯誤訊息

locale.c:81: cannot allocate 18 bytes

咕狗之後看到docker bash 也有一樣的錯誤訊息並且說明是musl 沒有實做 brk/sbrk 的關係

https://github.com/tianon/docker-bash/blob/master/4.4/Dockerfile

# musl does not implement brk/sbrk (they simply return -ENOMEM)
# bash: xmalloc: locale.c:81: cannot allocate 18 bytes (0 bytes allocated)

 

我也把一份已經編譯好的上傳在google drive bash

refer http://worldend.logdown.com/posts/276005-cross-compile-for-openwrt