extmod/modbluetooth: Add support for changing the GAP device name.

This commit allows the user to set/get the GAP device name used by service
0x1800, characteristic 0x2a00.  The usage is:

    BLE.config(gap_name="myname")
    print(BLE.config("gap_name"))

As part of this change the compile-time setting
MICROPY_PY_BLUETOOTH_DEFAULT_NAME is renamed to
MICROPY_PY_BLUETOOTH_DEFAULT_GAP_NAME to emphasise its link to GAP and this
new "gap_name" config value.  And the default value of this for the NimBLE
bindings is changed from "PYBD" to "MPY NIMBLE" to be more generic.

1 files changed, 19 insertions, 3 deletions

diff --git a/extmod/nimble/modbluetooth_nimble.c b/extmod/nimble/modbluetooth_nimble.c
index 9498e998b..69067e077 100644
--- a/extmod/nimble/modbluetooth_nimble.c
+++ b/extmod/nimble/modbluetooth_nimble.c
@@ -40,8 +40,8 @@
 #include "nimble/nimble_port.h"
 #include "services/gap/ble_svc_gap.h"
 
-#ifndef MICROPY_PY_BLUETOOTH_DEFAULT_NAME
-#define MICROPY_PY_BLUETOOTH_DEFAULT_NAME "PYBD"
+#ifndef MICROPY_PY_BLUETOOTH_DEFAULT_GAP_NAME
+#define MICROPY_PY_BLUETOOTH_DEFAULT_GAP_NAME "MPY NIMBLE"
 #endif
 
 #define DEBUG_EVENT_printf(...) //printf(__VA_ARGS__)
@@ -191,7 +191,7 @@ STATIC void sync_cb(void) {
         assert(rc == 0);
     }
 
-    ble_svc_gap_device_name_set(MICROPY_PY_BLUETOOTH_DEFAULT_NAME);
+    ble_svc_gap_device_name_set(MICROPY_PY_BLUETOOTH_DEFAULT_GAP_NAME);
 
     mp_bluetooth_nimble_ble_state = MP_BLUETOOTH_NIMBLE_BLE_STATE_ACTIVE;
 }
@@ -352,6 +352,22 @@ void mp_bluetooth_get_device_addr(uint8_t *addr) {
     #endif
 }
 
+size_t mp_bluetooth_gap_get_device_name(const uint8_t **buf) {
+    const char *name = ble_svc_gap_device_name();
+    *buf = (const uint8_t *)name;
+    return strlen(name);
+}
+
+int mp_bluetooth_gap_set_device_name(const uint8_t *buf, size_t len) {
+    char tmp_buf[MYNEWT_VAL(BLE_SVC_GAP_DEVICE_NAME_MAX_LENGTH) + 1];
+    if (len + 1 > sizeof(tmp_buf)) {
+        return MP_EINVAL;
+    }
+    memcpy(tmp_buf, buf, len);
+    tmp_buf[len] = '\0';
+    return ble_hs_err_to_errno(ble_svc_gap_device_name_set(tmp_buf));
+}
+
 int mp_bluetooth_gap_advertise_start(bool connectable, int32_t interval_us, const uint8_t *adv_data, size_t adv_data_len, const uint8_t *sr_data, size_t sr_data_len) {
     if (!mp_bluetooth_is_active()) {
         return ERRNO_BLUETOOTH_NOT_ACTIVE;