Allow setting SerialBT advertised name (#2181)

Trivial fix #2179

Author: earlephilhower

libraries/SerialBT/examples/BTSerialUppercase/BTSerialUppercase.ino

@@ -22,6 +22,7 @@
 #include <SerialBT.h>
 
 void setup() {
+  SerialBT.setName("PicoW UPPERCASE 00:00:00:00:00:00");
   SerialBT.begin();
 }
 

libraries/SerialBT/keywords.txt

@@ -11,6 +11,7 @@ SerialBT	KEYWORD1
 #######################################
 # Methods and Functions (KEYWORD2)
 #######################################
+setName	KEYWORD2
 
 #######################################
 # Constants (LITERAL1)

libraries/SerialBT/src/SerialBT.cpp

@@ -76,7 +76,10 @@ void SerialBT_::begin(unsigned long baud, uint16_t config) {
 
     gap_discoverable_control(1);
     gap_ssp_set_io_capability(SSP_IO_CAPABILITY_DISPLAY_YES_NO);
-    gap_set_local_name("PicoW Serial 00:00:00:00:00:00");
+    if (!_name) {
+        setName("PicoW Serial 00:00:00:00:00:00");
+    }
+    gap_set_local_name(_name);
 
     // Turn on!
     hci_power_control(HCI_POWER_ON);

libraries/SerialBT/src/SerialBT.h

@@ -37,6 +37,14 @@ class SerialBT_ : public HardwareSerial {
     SerialBT_();
 
     bool setFIFOSize(size_t size);
+    bool setName(const char *name) {
+        if (_running) {
+            return false;
+        }
+        free(_name);
+        _name = strdup(name);
+        return true;
+    }
 
     void begin(unsigned long baud = 115200) override {
         begin(baud, SERIAL_8N1);
@@ -82,4 +90,6 @@ class SerialBT_ : public HardwareSerial {
 
     volatile int _writeLen = 0;
     const void *_writeBuff;
+
+    char *_name = nullptr;
 };