WIP: adding support for multiple emotibits

Signed-off-by: Andrey Parfenov <a1994ndrey@gmail.com>

Author: Andrey1994

docs/SupportedBoards.rst

@@ -1248,6 +1248,7 @@ To create such board you need to specify the following board ID and fields of Br
 
 - :code:`BoardIds.EMOTIBIT_BOARD`
 - *optional:* :code:`ip_address`, you can provide *broadcast* ip address of the network with EmotiBit device, e.g. 192.168.178.255. If not provided BrainFlow will try to autodiscover the network and it may take a little longer.
+- *optional:* :code:`serial_number`, recommended you if have multiple boards in the same network.
 
 Initialization Example:
 

python_package/examples/tests/two_emotibits.py

@@ -0,0 +1,62 @@
+import argparse
+import time
+
+from brainflow.board_shim import BoardShim, BrainFlowInputParams, BoardIds, BrainFlowPresets
+from brainflow.data_filter import DataFilter
+
+
+def main():
+    BoardShim.enable_dev_board_logger()
+
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--id1', type=str, help='id for first emotibit', required=True)
+    parser.add_argument('--id2', type=str, help='id for second emotibit', required=True)
+    args = parser.parse_args()
+
+    params1 = BrainFlowInputParams()
+    params1.serial_number = args.id1
+    params2 = BrainFlowInputParams()
+    params2.serial_number = args.id2
+    board_id = BoardIds.EMOTIBIT_BOARD.value
+
+    presets = BoardShim.get_board_presets(board_id)
+    print (presets)
+
+    # Init both boards
+    board1 = BoardShim(board_id, params1)
+    board2 = BoardShim(board_id, params2)
+    board1.prepare_session()
+    board2.prepare_session()
+
+    # Start streaming for both
+    board1.start_stream()
+    board2.start_stream()
+    time.sleep(10)
+
+    # Get data from both
+    data_default1 = board1.get_board_data(preset=BrainFlowPresets.DEFAULT_PRESET)
+    data_aux1 = board1.get_board_data(preset=BrainFlowPresets.AUXILIARY_PRESET)
+    data_anc1 = board1.get_board_data(preset=BrainFlowPresets.ANCILLARY_PRESET)
+    data_default2 = board2.get_board_data(preset=BrainFlowPresets.DEFAULT_PRESET)
+    data_aux2 = board2.get_board_data(preset=BrainFlowPresets.AUXILIARY_PRESET)
+    data_anc2 = board1.get_board_data(preset=BrainFlowPresets.ANCILLARY_PRESET)
+
+    # Stop streaming for both
+    board1.stop_stream()
+    board2.stop_stream()
+
+    # Release both boards
+    board1.release_session()
+    board2.release_session()
+
+    # Write data from both
+    DataFilter.write_file(data_default1, 'default1.csv', 'w')
+    DataFilter.write_file(data_aux1, 'aux1.csv', 'w')
+    DataFilter.write_file(data_anc1, 'anc1.csv', 'w')
+    DataFilter.write_file(data_default2, 'default2.csv', 'w')
+    DataFilter.write_file(data_aux2, 'aux2.csv', 'w')
+    DataFilter.write_file(data_anc2, 'anc2.csv', 'w')
+
+
+if __name__ == "__main__":
+    main()

src/board_controller/emotibit/emotibit.cpp

@@ -493,6 +493,13 @@ std::vector<std::string> Emotibit::split_string (const std::string &package, cha
 
 bool Emotibit::get_header (
     const std::string &package_string, int *package_num, int *data_len, std::string &type_tag)
+{
+    std::string serial_number = "";
+    return get_header (package_string, package_num, data_len, type_tag, serial_number);
+}
+
+bool Emotibit::get_header (const std::string &package_string, int *package_num, int *data_len,
+    std::string &type_tag, std::string &serial_number)
 {
     std::vector<std::string> package = split_string (package_string, PAYLOAD_DELIMITER);
     if (package.size () >= HEADER_LENGTH)
@@ -518,6 +525,13 @@ bool Emotibit::get_header (
             if (package.at (3) != "")
             {
                 type_tag = package.at (3);
+                if (type_tag == HELLO_HOST)
+                {
+                    if (package.size () > 9)
+                    {
+                        serial_number = package.at (9);
+                    }
+                }
             }
             else
             {
@@ -630,13 +644,21 @@ int Emotibit::create_adv_connection ()
                         int package_num = 0;
                         int data_len = 0;
                         std::string type_tag = "";
-                        if (get_header (recv_package, &package_num, &data_len, type_tag))
+                        std::string serial_number = "";
+                        if (get_header (
+                                recv_package, &package_num, &data_len, type_tag, serial_number))
                         {
                             safe_logger (spdlog::level::info, "received {} package", type_tag);
-                            if ((type_tag == HELLO_HOST) || (type_tag == PONG))
+                            if (type_tag == HELLO_HOST)
                             {
-                                found = true;
-                                ip_address = emotibit_ip;
+                                safe_logger (
+                                    spdlog::level::info, "Found emotibit: {}", serial_number);
+                                if (params.serial_number.empty () ||
+                                    (params.serial_number == serial_number))
+                                {
+                                    found = true;
+                                    ip_address = emotibit_ip;
+                                }
                             }
                         }
                         else
@@ -795,7 +817,7 @@ int Emotibit::wait_for_connection ()
     }
     else
     {
-        int max_attempts = 15;
+        int max_attempts = 20;
         for (int i = 0; i < max_attempts; i++)
         {
             safe_logger (spdlog::level::trace, "waiting for accept {}/{}", i, max_attempts);

src/board_controller/emotibit/inc/emotibit.h

@@ -45,6 +45,8 @@ class Emotibit : public Board
     std::vector<std::string> split_string (const std::string &package, char delim);
     bool get_header (
         const std::string &package_string, int *package_num, int *data_len, std::string &type_tag);
+    bool get_header (const std::string &package_string, int *package_num, int *data_len,
+        std::string &type_tag, std::string &serial_number);
     std::vector<std::string> get_payload (const std::string &package_string, int data_len);
 
     int create_adv_connection ();