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espressif / esp-at

AT application for ESP32/ESP32-C2/ESP32-C3/ESP32-C6/ESP8266
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[ESP32AT-164] Classic Bluetooth SPP Connection issue #138

Closed Arti4ever closed 5 years ago

Arti4ever commented 6 years ago

Hi, I'va got an ESP32_Wrover with External RAM enabled. SPP connection (AT+BTSPPCONN) seems not working.

I enabled bluetooth : AT+BTINIT=1 OK then I enabled SPP : AT+BTSPPINIT=1 OK

but when I trying to connect to my device I get an Error: AT+BTSPPCONN=0,0,0,"00:06:66:77:7e:ca" ERROR

I tryied with different (as describe in doc) but I can't get it work. It always return "ERROR"

By the way, How do we specify the PIN code for connection ?

Arti4ever commented 6 years ago

Any update ?

Arti4ever commented 5 years ago

up

xiewenxiang commented 5 years ago

@Arti4ever

Please pull the latest master branch. Before compile the project, you need enable the BT command and set bluetooth controller dual mode.

make menuconfig -> component config -> Bluettoth -> Bluetooth controller -> Bluetooth controller mode -> Bluetooth Dual Mode

vagr02 commented 5 years ago

Hi, i am facing same problems with SPP. I am using development kit LyraT with WROVER module. I set all configurations in menuconfig - enabled PSRAM ( i can see more RAM by command AT+SYSRAM? so, it works) . enabled Bluetooth and AT commands for Classic Bluetooth, but still i can see ERRORs only when i use AT+BTSPPCONN , AT+BTSPPSTART. AT+BYSPPSEND. Only working command is AT+BTSPPINIT, it shows OK. Could you please tell me correct initialization of SPP connection? at moment i do: AT+BTINIT=1 OK AT+BTNAME="ESP32_BT_AT" OK AT+BTSPPINIT=1 OK AT+BTSPPCONN=0,0,0,"xx:xx:xx:xx:xx:xx" // ( i used valid remote address here) ERROR AT+BTSPPSTART ERROR

xiewenxiang commented 5 years ago

Hi @vagr02

If you want to connect PC to ESP32：

AT+BTINIT=1
AT+BTSPPINIT=2
AT+BTNAME="asdasdasdad"
AT+BTSCANMODE=2
AT+BTSPPSTART

Then you can initiate a connection from the PC. You can also connect two ESP32 pieces:

slave

AT+BTINIT=1
AT+BTSPPINIT=2
AT+BTNAME="asdasdasdad"
AT+BTSCANMODE=2
AT+BTSPPSTART

master

AT+BTINIT=1
AT+BTSPPINIT=1
AT+BTNAME=“1221312312”
AT+BTSCANMODE=2
AT+BTSTARTDISC=0,5,0
AT+BTSPPCONN=0,0,"xx:xx:xx:xx:xx:xx"
vagr02 commented 5 years ago

Great, it works! Thank you very much. I see, there is AT+BTSPPINIT=2 (i didnt find this value in documentation ESP32_AT_Commands_Set.md) I have one more question to this topic. How can i change security mode in slave mode? I need to use legacy pin code mode 4-digit pin. Can i use for this AT+BTSPPCONN command somehow?

xiewenxiang commented 5 years ago

Hi @vagr02 We are working on these commands, It should be done by next week.

vagr02 commented 5 years ago

Hello, i hope it will be possible to set different security modes. I am working for producer of digital multimeters (Gossen Metrahit series) and we plan use ESP32 modules as communication interface for Wifi and Bluetooth classic. We would like to replace current Bluetooh module from Microchip RN4678. Therefore we need to implement in ESP32 some of features of RN4678. One of them is this 4 pin security mode and other is possibility to change UUID from default Serial Port 0x1101 to a different number. RN4678 uses a command for this , but in beginnig even setting in menuconfig, or possibility to change this manually in a sourcecode would be enough for us.

vagr02 commented 5 years ago

I was testing new commands and i am not sure how to use them to be able to enter legacy PIN code. I think i should use command: AT+BTSECPARAM=3,1,"1234" - fixed PIN, but when PC connects to ESP32 it shows variable (randomly generated) PIN. This happens when i am using USB-Bluetooth adaptor v4.0 EDR. When i use older v3.0 Bluetooth adaptor i can see dialog for entering PIN code. This happens in Win 10.

xiewenxiang commented 5 years ago

@vagr02

you need to disable the simple pair

disable_ssp.patch.txt

xiewenxiang commented 5 years ago

@vagr02 If you want to change the SPP UUID, you can change this manually in the source code.

the path is esp-idf/components/bt/bluedroid/api/esp_spp_api.c

static const uint8_t  UUID_SPP[16] = {0x00, 0x00, 0x11, 0x01, 0x00, 0x00, 0x10, 0x00,
                                      0x80, 0x00, 0x00, 0x80, 0x5F, 0x9B, 0x34, 0xFB
                                     };
vagr02 commented 5 years ago

I tried to change UUID in esp_spp_api.c , but it still shows identification 0x1101. I cleaned flash, build completely new firmware but UUID is still same. I am not sure if there in sourcecode is not UUID rewritten somewhere.

xiewenxiang commented 5 years ago

Does BT SPP working now? We will close this issue, if you still have this questions, you can open it again.