fix typos and format

examples/bluetooth/bluedroid/classic_bt/bt_spp_acceptor/README.md

@@ -1,9 +1,9 @@
 | Supported Targets | ESP32 |
 | ----------------- | ----- |
 
-## ESP-IDF BT-SPP-ACCEPTOR demo
+## ESP-IDF BT-SPP-ACCEPTOR Example
 
-This example is to show how to use the APIs of **Serial Port Protocol** (**SPP**) to create an SPP acceptor which performs as a server. We aggregate **Secure Simple Pair** (**SSP**) into this demo to show how to use SPP when creating your own APPs. We also provide the demo `bt_spp_initiator` or the demo `bt_spp_vfs_initiator` to create an SPP initiator which performs as a client. In fact, you can create SPP acceptors and SPP initiators on a single device at the same time.
+This example is to show how to use the APIs of **Serial Port Protocol** (**SPP**) to create an SPP acceptor which performs as a server. We aggregate **Secure Simple Pair** (**SSP**) into this example to show how to use SPP when creating your own APPs. We also provide the example `bt_spp_initiator` or the example `bt_spp_vfs_initiator` to create an SPP initiator which performs as a client. In fact, you can create SPP acceptors and SPP initiators on a single device at the same time.
 
 ## How to use example
 
@@ -58,7 +58,7 @@ After the program starts, the example will start an SPP acceptor. The example wi
 
 ## FAQ
 Q: How to change the process of SSP?
-A: Users can set the IO Capability and Security Mask for their device (fixed Security Mode, Security Mode 4). In short, the Security Mask sets the security level for authentication stage and the IO Capability determines the way of user interaction during pairing. The default Security Mask of this demo is `ESP_SPP_SEC_AUTHENTICATE` which support MITM (Man In The Middle) protection. For more information about Security Simple Pair on ESP32, please refer to [ESP32_SSP](./ESP32_SSP.md).
+A: Users can set the IO Capability and Security Mask for their device (fixed Security Mode, Security Mode 4). In short, the Security Mask sets the security level for authentication stage and the IO Capability determines the way of user interaction during pairing. The default Security Mask of this example is `ESP_SPP_SEC_AUTHENTICATE` which support MITM (Man In The Middle) protection. For more information about Security Simple Pair on ESP32, please refer to [ESP32_SSP](./ESP32_SSP.md).
 
 
 Q: How many SPP servers does ESP32 support?

examples/bluetooth/bluedroid/classic_bt/bt_spp_acceptor/main/main.c

@@ -39,7 +39,7 @@ static long data_num = 0;
 static const esp_spp_sec_t sec_mask = ESP_SPP_SEC_AUTHENTICATE;
 static const esp_spp_role_t role_slave = ESP_SPP_ROLE_SLAVE;
 
-static char *bda2str(uint8_t * bda, char *str, size_t size)
+static char *bda2str(uint8_t *bda, char *str, size_t size)
 {
     if (bda == NULL || str == NULL || size < 18) {
         return NULL;

examples/bluetooth/bluedroid/classic_bt/bt_spp_initiator/README.md

@@ -1,9 +1,9 @@
 | Supported Targets | ESP32 |
 | ----------------- | ----- |
 
-# ESP-IDF BT-SPP-INITATOR demo
+# ESP-IDF BT-SPP-INITATOR Example
 
-This example is to show how to use the APIs of **Serial Port Protocol** (**SPP**) to create an SPP initiator which performs as a client. we aggregate **Secure Simple Pair** (**SSP**) into this demo to show how to use SPP when creating your own APPs. We also provide the demo `bt_spp_acceptor` or the demo `bt_spp_vfs_acceptor` to create an SPP acceptor which performs as a server. In fact, you can create SPP acceptors and SPP initiators on a single device at the same time.
+This example is to show how to use the APIs of **Serial Port Protocol** (**SPP**) to create an SPP initiator which performs as a client. we aggregate **Secure Simple Pair** (**SSP**) into this example to show how to use SPP when creating your own APPs. We also provide the example `bt_spp_acceptor` or the example `bt_spp_vfs_acceptor` to create an SPP acceptor which performs as a server. In fact, you can create SPP acceptors and SPP initiators on a single device at the same time.
 
 ## How to use example
 
@@ -110,7 +110,7 @@ Whether you should passkey or confirm the number also depends on the IO capabili
 
 - Set `SPP_SHOW_MODE` as `SPP_SHOW_DATA` or `SPP_SHOW_SPEED` in code (should be same with `bt_spp_acceptor`, if the peer device runs it). When setting `SPP_SHOW_MODE` as `SPP_SHOW_DATA`, if the data rate is too high or the data length is too long, it is strongly recommended to process them in other lower priority application task rather than in this callback directly. Since the printing takes too much time, and it may stuck the Bluetooth stack.
 
-- We haven't do the same update to `bt_acceptor_demo` for the sake of reducing the size of ESP_IDF, but transplanting of input module is supported.
+- We haven't do the same update to the example `bt_spp_acceptor` for the sake of reducing the size of ESP_IDF, but transplanting of input module is supported.
 
 ## Example Breakdown
 
@@ -124,7 +124,7 @@ To clearly show how the SSP aggregate with the SPP , we use the Commands and Eff
 
 ## FAQ
 Q: How to change the process of SSP?
-A: Users can set the IO Capability and Security Mask for their device (fixed Security Mode, Security Mode 4). In short, the Security Mask sets the security level for authentication stage and the IO Capability determines the way of user interaction during pairing. The default Security Mask of this demo is `ESP_SPP_SEC_AUTHENTICATE` which support MITM (Man In The Middle) protection. For more information about Security Simple Pair on ESP32, please refer to [ESP32_SSP](../bt_spp_acceptor/ESP32_SSP.md).
+A: Users can set the IO Capability and Security Mask for their device (fixed Security Mode, Security Mode 4). In short, the Security Mask sets the security level for authentication stage and the IO Capability determines the way of user interaction during pairing. The default Security Mask of this example is `ESP_SPP_SEC_AUTHENTICATE` which support MITM (Man In The Middle) protection. For more information about Security Simple Pair on ESP32, please refer to [ESP32_SSP](../bt_spp_acceptor/ESP32_SSP.md).
 
 Q: How can we reach the maximum throughput when using SPP?
 A: The default MTU size of classic Bluetooth SPP on ESP32 is 990 bytes, and higher throughput can be achieved in the case that data chunck size is close to the MTU size or multiple of MTU size. For example, sending 100 bytes data per second is much better than sending 10 bytes every 100 milliseconds.

examples/bluetooth/bluedroid/classic_bt/bt_spp_initiator/main/main.c

@@ -56,7 +56,7 @@ static const uint8_t inq_num_rsps = 0;
 static uint8_t spp_data[SPP_DATA_LEN];
 static uint8_t *s_p_data = NULL; /* data pointer of spp_data */
 
-static char *bda2str(uint8_t * bda, char *str, size_t size)
+static char *bda2str(uint8_t *bda, char *str, size_t size)
 {
     if (bda == NULL || str == NULL || size < 18) {
         return NULL;

examples/bluetooth/bluedroid/classic_bt/bt_spp_vfs_acceptor/README.md

@@ -1,9 +1,9 @@
 | Supported Targets | ESP32 |
 | ----------------- | ----- |
 
-## ESP-IDF BT-SPP-VFS-ACCEPTOR demo
+## ESP-IDF BT-SPP-VFS-ACCEPTOR Example
 
-This example is to show how to use the APIs of **Serial Port Protocol** (**SPP**) to create an SPP acceptor which performs as a server, and it will register into the VFS. We aggregate **Secure Simple Pair** (**SSP**) into this demo to show how to use SPP when creating your own APPs. We also provide the demo `bt_spp_initiator` or the demo `bt_spp_vfs_initiator` to create an SPP initiator which performs as a client. In fact, you can create SPP acceptors and SPP initiators on a single device at the same time.
+This example is to show how to use the APIs of **Serial Port Protocol** (**SPP**) to create an SPP acceptor which performs as a server, and it will register into the VFS. We aggregate **Secure Simple Pair** (**SSP**) into this example to show how to use SPP when creating your own APPs. We also provide the example `bt_spp_initiator` or the example `bt_spp_vfs_initiator` to create an SPP initiator which performs as a client. In fact, you can create SPP acceptors and SPP initiators on a single device at the same time.
 
 ## How to use example
 

examples/bluetooth/bluedroid/classic_bt/bt_spp_vfs_acceptor/main/main.c

@@ -47,7 +47,7 @@ static const esp_spp_role_t role_slave = ESP_SPP_ROLE_SLAVE;
 
 #define SPP_DATA_LEN 100
 
-static char *bda2str(uint8_t * bda, char *str, size_t size)
+static char *bda2str(uint8_t *bda, char *str, size_t size)
 {
     if (bda == NULL || str == NULL || size < 18) {
         return NULL;

examples/bluetooth/bluedroid/classic_bt/bt_spp_vfs_initiator/README.md

@@ -1,9 +1,9 @@
 | Supported Targets | ESP32 |
 | ----------------- | ----- |
 
-# ESP-IDF BT-SPP-INITATOR demo
+# ESP-IDF BT-SPP-INITATOR Example
 
-This example is to show how to use the APIs of **Serial Port Protocol** (**SPP**) to create an SPP initiator which performs as a client, and it will register into the VFS. we aggregate **Secure Simple Pair** (**SSP**) into this demo to show how to use SPP when creating your own APPs. We also provide the demo `bt_spp_acceptor` or the demo `bt_spp_vfs_acceptor` to create an SPP acceptor which performs as a server. In fact, you can create SPP acceptors and SPP initiators on a single device at the same time.
+This example is to show how to use the APIs of **Serial Port Protocol** (**SPP**) to create an SPP initiator which performs as a client, and it will register into the VFS. we aggregate **Secure Simple Pair** (**SSP**) into this example to show how to use SPP when creating your own APPs. We also provide the example `bt_spp_acceptor` or the example `bt_spp_vfs_acceptor` to create an SPP acceptor which performs as a server. In fact, you can create SPP acceptors and SPP initiators on a single device at the same time.
 
 ## How to use example
 

examples/bluetooth/bluedroid/classic_bt/bt_spp_vfs_initiator/main/main.c

@@ -54,7 +54,7 @@ static const uint8_t inq_num_rsps = 0;
 
 #define SPP_DATA_LEN 20
 
-static char *bda2str(uint8_t * bda, char *str, size_t size)
+static char *bda2str(uint8_t *bda, char *str, size_t size)
 {
     if (bda == NULL || str == NULL || size < 18) {
         return NULL;