Avoid deadlock BT/LE HID send when disconnected (#2252)

Fixes #2251

The 2-phase send could get out of whack if transmission was attempted when
no device was connected. Clear things up so if things aren't connected,
then no data gets set as pending.

Author: earlephilhower

libraries/HID_Bluetooth/src/PicoBluetoothBLEHID.h

@@ -178,11 +178,13 @@ class PicoBluetoothBLEHID_ {
         while (connected() && _needToSend) {
             /* noop busy wait */
         }
-        _needToSend = true;
-        _sendReport = rpt;
-        _sendReportLen = len;
         __lockBluetooth();
-        hids_device_request_can_send_now_event(_con_handle);
+        if (connected()) {
+            _needToSend = true;
+            _sendReport = rpt;
+            _sendReportLen = len;
+            hids_device_request_can_send_now_event(_con_handle);
+        }
         __unlockBluetooth();
         while (connected() && _needToSend) {
             /* noop busy wait */

libraries/HID_Bluetooth/src/PicoBluetoothHID.h

@@ -142,12 +142,14 @@ class PicoBluetoothHID_ {
     }
 
     bool send(int id, void *rpt, int len) {
-        _needToSend = true;
-        _sendReportID = id;
-        _sendReport = rpt;
-        _sendReportLen = len;
         __lockBluetooth();
-        hid_device_request_can_send_now_event(getCID());
+        if (connected()) {
+            _needToSend = true;
+            _sendReportID = id;
+            _sendReport = rpt;
+            _sendReportLen = len;
+            hid_device_request_can_send_now_event(getCID());
+        }
         __unlockBluetooth();
         while (connected() && _needToSend) {
             /* noop busy wait */