83a8076db8
* +sync, get/set default nodelay, sync * default nodelay=1 * update flush() * fix return value * ClientContext: put things together * ClientContext: fix debugging messages * WiFiClient: move static members out of the class, add comments * remove circular dependency * parameter and return value for Client::flush&stop, flush timeout raised to 300ms * tcp flush: restart timer on ack receive * OTA protocol needs setNoDelay(true) * fix Ethernet with Client changes * 1 line unredable -> 5 lines readable code * doc * Update client-class.rst * Added details for getters
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Client Class
Methods documented for Client in Arduino
Methods and properties described further down are specific to ESP8266. They are not covered in Arduino WiFi library documentation. Before they are fully documented please refer to information below.
flush and stop
flush(timeoutMs) and stop(timeoutMs) both
have now an optional argument: timeout in millisecond, and
both return a boolean.
Default input value 0 means that effective value is left at the discretion of the implementer.
flush() returning true indicates that
output data have effectively been sent, and false that a
timeout has occurred.
stop() returns false in case of an issue
when closing the client (for instance a timed-out flush).
Depending on implementation, its parameter can be passed to
flush().
setNoDelay
setNoDelay(nodelay)With nodelay set to true, this function
will to disable Nagle
algorithm.
This algorithm is intended to reduce TCP/IP traffic of small packets sent over the network by combining a number of small outgoing messages, and sending them all at once. The downside of such approach is effectively delaying individual messages until a big enough packet is assembled.
Example:
client.setNoDelay(true);getNoDelay
Returns whether NoDelay is enabled or not for the current connection.
setSync
This is an experimental API that will set the client in synchronized
mode. In this mode, every write() is flushed. It means that
after a call to write(), data are ensured to be received
where they went sent to (that is flush semantic).
When set to true in WiFiClient
implementation,
- It slows down transfers, and implicitely disable the Nagle algorithm.
- It also allows to avoid a temporary copy of data that otherwise
consumes at most
TCP_SND_BUF= (2 *MSS) bytes per connection,
getSync
Returns whether Sync is enabled or not for the current connection.
setDefaultNoDelay and setDefaultSync
These set the default value for both setSync and
setNoDelay for every future instance of
WiFiClient (including those coming from
WiFiServer.available() by default).
Default values are false for both NoDelay and
Sync.
This means that Nagle is enabled by default for all new connections.
getDefaultNoDelay and getDefaultSync
Return the values to be used as default for NoDelay and Sync for all future connections.
Other Function Calls
uint8_t status ()
virtual size_t write (const uint8_t *buf, size_t size)
size_t write_P (PGM_P buf, size_t size)
size_t write (Stream &stream)
size_t write (Stream &stream, size_t unitSize) __attribute__((deprecated))
virtual int read (uint8_t *buf, size_t size)
virtual int peek ()
virtual size_t peekBytes (uint8_t *buffer, size_t length)
size_t peekBytes (char *buffer, size_t length)
virtual operator bool ()
IPAddress remoteIP ()
uint16_t remotePort ()
IPAddress localIP ()
uint16_t localPort () Documentation for the above functions is not yet prepared.
For code samples please refer to separate section with examples ➡️ dedicated specifically to the Client Class.