Limit the number of simultaneously connected devices to BluetoothSerial to only 1 (espressif#2061)

Author: mouridis

libraries/BluetoothSerial/src/BluetoothSerial.cpp

@@ -50,6 +50,7 @@ static xQueueHandle _spp_tx_queue = NULL;
 static SemaphoreHandle_t _spp_tx_done = NULL;
 static TaskHandle_t _spp_task_handle = NULL;
 static EventGroupHandle_t _spp_event_group = NULL;
+static boolean secondConnectionAttempt;
 
 #define SPP_RUNNING 0x01
 #define SPP_CONNECTED 0x02
@@ -162,13 +163,22 @@ static void esp_spp_cb(esp_spp_cb_event_t event, esp_spp_cb_param_t *param)
  break;
 
  case ESP_SPP_SRV_OPEN_EVT://Server connection open
- _spp_client = param->open.handle;
+ if (!_spp_client){
+ _spp_client = param->open.handle;
+ } else {
+ secondConnectionAttempt = true;
+ esp_spp_disconnect(param->open.handle);
+ }
  xEventGroupSetBits(_spp_event_group, SPP_CONNECTED);
  log_i("ESP_SPP_SRV_OPEN_EVT");
  break;
 
  case ESP_SPP_CLOSE_EVT://Client connection closed
- _spp_client = 0;
+ if(secondConnectionAttempt) {
+ secondConnectionAttempt = false;
+ } else {
+ _spp_client = 0;
+ }
  xEventGroupClearBits(_spp_event_group, SPP_CONNECTED);
  log_i("ESP_SPP_CLOSE_EVT");
  break;