昨天無意找到了兩個藍牙模塊，花了幾個小時研究研究，雖然只有幾個小時，可謂艱辛啊！因爲，沒資料，什麼都沒有，也不能確定硬件的好壞！
有6個pin，也不知道這pin是幹什麼用的！（VCC，GND，TXD，RXD，SET，3.3V）特別是哪個SET，搞不懂，我就瞎接；剛開始的時候，他發送過來都是一堆亂碼，憑藉我多年的經驗，肯定是波特率設置不對；然後接收的數據總是斷斷續續的，很是鬱悶；檢查下硬件，發現很多地方都有脫焊的嫌疑；於是乎，就重新找來焊烙鐵，把每個焊點都重新焊了一遍；這次終於有數據了，但是對他的命令集都不是很熟悉；於是隨便在網上沒有目的的搜索了一陣，找了個跟我的長的差不多的！瞬間像是找到了救命稻草；
還是憑藉我多年的經驗，先找HELP；發現一個AT+HELP指令，就二話沒說輸進去了，可是沒反應啊！鬱悶；這裏讓我想到了sms短信收發的AT指令；心想是不是少了個/r/n，我就在命令後面回車了一下；發送終於出來了；
Command Description
-----------------------------------------------------------------
AT Check if the command terminal work normally
AT+RESET Software reboot
AT+VERSION Get firmware, bluetooth, HCI and LMP version
AT+HELP List all the commands
AT+NAME Get/Set local device name
AT+PIN Get/Set pin code for pairing
AT+BAUD Get/Set baud rate
AT+CLEAR Remove the remembered remote address
AT+LADDR Get local bluetooth address
AT+RNAME Get remote device name
AT+DEFAULT Restore factory default
AT+CMODE Get/Set connection mode
AT+BIND Get/Set bind bluetooth address
AT+COD Get/Set local class of device
AT+IAC Get/Set inquiry access code
AT+ROLE Get/Set master or slave mode
AT+STATE Get current state
AT+SENM Get/Set security and encryption mode
AT+IPSCAN Get/Set page and inquiry scan parameters
AT+SNIFF Get/Set sniff power table parameters
AT+LOWPOWER Start/Stop low power mode
AT+UARTMODE Get/Set uart stop bits and parity
AT+ENABLEIND Enable/Disable Indication print
AT+LSP List Paired Device List
AT+RESETPDL Reset Paired Device List
AT+REMOVEPDL Remove one entry from Paired Device List
AT+SUPERVISION Get/Set supervision timeout
AT+AUTOINQ Start/Stop auto inquiry
AT+INQ Start inquiry
AT+INQC Cancel ongoing inquiry
(M)AT+AUTOCONN Start/Stop auto connection
(M)AT+INQM Get/Set inquiry parameters
(M)AT+CONNECT Connect to a remote device by BD address
-----------------------------------------------------------------
Note: (M) = The command support master mode only, other commands
support both master and slave mode.
For more information, please visit http://www.bolutek.cn
Copyright@2012 www.bolutek.cn. All rights reserved.就按照網址點進去找我的型號；才發現我的型號是BLK-MD-BC04-B
裏面在網上找到了他的所有指令集；從頭到尾大致看了下；
指令集下載的話，大家直接在百度裏面搜BLK-MD-BC04-B-AT指令集，一大堆！！！
這是才知道，原來那個SET的作用是決定Beeth是Master Mode 還是 Slave Mode；
SET 接高電平爲Master模式；
SET 懸空，及默認狀態下，或者接地爲Slave 模式；
特別注意：有些指令集只有Master mode才能使用：
(M)AT+AUTOCONN Start/Stop auto connection
(M)AT+INQM Get/Set inquiry parameters
(M)AT+CONNECT Connect to a remote device by BD address
-----------------------------------------------------------------
Note: (M) = The command support master mode only, other commands*** BOLUTEK SPP Bluetooth Module V2.43 Init OK in SLAVE mode!***
*** Please input AT+HELP <cr><lf> to get commands list. ***
*** For more information, please visit http://www.bolutek.cn ***
+READY
+PAIRABLE
+CONNECTING<<b0:ee:45:12:b1:38
+RNAME=Lenovo A789
+CONNECTED
呵呵呵呵你好啊！我發現你了！你好啊！我發現你了！+DISC:SUCCESS
+READY
+PAIRABLE
ERROR=117
ERROR=117
+COD=001f00,000000
ERROR=105
ERROR=105
+ROLE=0
+ROLE=1
OK
+STATE=3
OK
+LADDR=00:15:ff:f3:cc:c9
OK
LSP=0,b0:ee:45:12:b1:38,Lenovo A789
LSP=E
ERROR=305
ERROR=305
ERROR=302
+ROLE=1*** BOLUTEK SPP Bluetooth Module V2.43 Init OK in MASTER mode!***
*** Please input AT+HELP <cr><lf> to get commands list. ***
*** For more information, please visit http://www.bolutek.cn ***
+READY
+INQS
+ROLE=1
ERROR=305
+INQE
+INQS
+INQ:b0:ee:45:12:b1:38,5a0204,-34
+CONNECTING>>b0:ee:45:12:b1:38
+INQE
+CONNECTED
+DISC:SUCCESS
+READY
+CONNECTING>>b0:ee:45:12:b1:38
+CONNECTION FAILED
+CONNECTING>>b0:ee:45:12:b1:38
+CONNECTION FAILED
+CONNECTING>>b0:ee:45:12:b1:38
+CONNECTION FAILED通信就像給串口發送數據一樣；串口的收發數據我想大家都知道，不必我多說吧？？只要你發送的指令不給at指令集識別，他都會把他發送到接受方；
