F/W Specification and Restriction

Firmware	Product
P40	P4S-341, P4S-342, P4M-400

Item	Value	Description
ENVS	1,536	Size of System ENV, byte
ENVU	1,536	Size of User ENV, byte
WLAN	1	Wireless LAN
EMAC	1	Ethernet
UART	2	The number of UART
FLOAT	Support	Floating Point Numbers
SSL	Support	SSL communication
PHP_MAX_NAME_SPACE	16	The number of Namespace
PHP_NAME_LEN	32	Size of User Identifier
PHP_MAX_USER_DEF_NAME	480	The number of User Identifier
PHP_LLSTR_BLK_SIZE	64	Size of String Block, byte
PHP_MAX_LLSTR_BLK	192	The number of String Blocks
string buffer size	12K	Size of string buffer, byte
PHP_MAX_STRING_LEN	1,536	Size of string variable, byte
PHP_INT_MAX	≒ 9.2*10¹⁸	Max value of integer type
EZFS_MAX_NAME_LEN	64	Size of EZFS filename, byte
TASK	2	The number of Task
TCP	5	The number of TCP
UDP	5	The number of UDP
TCP_RXBUF_SIZE	1,068	TCP receive buffer size
TCP_TXBUF_SIZE	1,152	TCP send buffer size
PDB_TXBUF_SIZE	2,048	PHPoCD send buffer size
HTTP_TXBUF_SIZE	1,536	HTTP send buffer size
UART_RXBUF_SIZE	1,024	UART send/receive buffer size
UDP_RXBUF_SIZE	512	UDP receive buffer size
ST	8	Software Timer
HT	4	Hardware Timer
ADC	2	Analog Input (ADC)
SPI	1	SPI
I2C	1	I2C
RTC	1	RTC

Item	limitation
Level of Namespace	PHP_MAX_NAME_SPACE - 1
Level of Function Call	PHP_MAX_NAME_SPACE - 2
Size of User Identifier	PHP_NAME_LEN - 1
Size of String Variable	PHP_MAX_STRING_LEN - 2
Size of Array Offset	string length - 2
Size of Filename	EZFS_MAX_NAME_LEN - 1
Size of arguments for system function	PHP_LLSTR_BLK_SIZE - 1
Size of arguments for pid_ioctl function	PHP_LLSTR_BLK_SIZE - 1
Size of $address of function sendto	PHP_LLSTR_BLK_SIZE - 1
Size of $needle & $replace of function str_replace	PHP_LLSTR_BLK_SIZE - 1
Size of $address of function inet_pton	PHP_LLSTR_BLK_SIZE - 1
Size of $address of function inet_ntop	PHP_LLSTR_BLK_SIZE - 1
Size of $delimiter of function explode	PHP_LLSTR_BLK_SIZE - 1
Maximum size of UDP data for receiving	UDP receive buffer size - 2