Rebaseing to current master

Author: MubeenHCLite

targets/TARGET_STM/can_api.c

@@ -400,7 +400,7 @@ int can_write(can_t *obj, CAN_Message msg, int cc)
 
 int can_read(can_t *obj, CAN_Message *msg, int handle)
 {
-    UNUSED(handle); // Not supported
+    UNUSED(handle); // Not supported, RXFIFO0 is set default by can_filter and cannot be changed.
 
     if (HAL_FDCAN_GetRxFifoFillLevel(&obj->CanHandle, FDCAN_RX_FIFO0) == 0) {
         return 0; // No message arrived
@@ -1109,10 +1109,6 @@ int can_mode(can_t *obj, CanMode mode)
 int can_filter(can_t *obj, uint32_t id, uint32_t mask, CANFormat format, int32_t handle)
 {
     int success = 0;
-
-    if(handle != 0) { // message filter handle not supported yet for STM controllers
-        return 0;
-    }
 
     // filter for CANAny format cannot be configured for STM32
     if ((format == CANStandard) || (format == CANExtended)) {