Add CELLULAR_CONFIG_PKTIO_READ_BUFFER_SIZE config (FreeRTOS#173)

* Add CELLULAR_CONFIG_PKTIO_READ_BUFFER_SIZE config

Author: chinglee-iot

docs/doxygen/pages.dox

@@ -196,6 +196,9 @@ Some configuration settings are C pre-processor constants, and some are function
 @section CELLULAR_CONFIG_PLATFORM_FREERTOS
 @copydoc CELLULAR_CONFIG_PLATFORM_FREERTOS
 
+@section CELLULAR_CONFIG_PKTIO_READ_BUFFER_SIZE
+@copydoc CELLULAR_CONFIG_PKTIO_READ_BUFFER_SIZE
+
 @section CELLULAR_MODEM_NO_EPS_NETWORK
 @brief Macro to disable querying evolved packet system (EPS) network registration status in Cellular_CommonGetServiceStatus.<br>
 @note Cellular modem porting can define this macro in cellular_config.h to disable this function.<br>

source/include/cellular_config_defaults.h

@@ -503,6 +503,19 @@
     #define PlatformQueue_Delete     vQueueDelete
 #endif /* if CELLULAR_CONFIG_PLATFORM_FREERTOS */
 
+/**
+ * @brief Pktio read buffer size.
+ *
+ * The pktio read buffer size should be configured to greater than the maximum AT command
+ * response size, which is typically the TCP socket receive command response packet size.
+ *
+ * <b>Possible values:</b>`Any positive integer`<br>
+ * <b>Default value (if undefined):</b> 1600
+ */
+#ifndef CELLULAR_CONFIG_PKTIO_READ_BUFFER_SIZE
+    #define CELLULAR_CONFIG_PKTIO_READ_BUFFER_SIZE    1600U
+#endif
+
 /**
  * @brief Macro that is called in the cellular library for logging "Error" level
  * messages.

source/include/private/cellular_common_internal.h

@@ -48,7 +48,7 @@
 
 /*-----------------------------------------------------------*/
 
-#define PKTIO_READ_BUFFER_SIZE     ( 1600U )      /* This should be larger than TCP packet size. */
+#define PKTIO_READ_BUFFER_SIZE     ( CELLULAR_CONFIG_PKTIO_READ_BUFFER_SIZE )
 #define PKTIO_WRITE_BUFFER_SIZE    ( CELLULAR_AT_CMD_MAX_SIZE )
 
 /*-----------------------------------------------------------*/