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WifiS3 - Non blocking Wifi connect #461

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99df703
Prevent blocking whilst waiting for a connection and introduce a read…
k3ldar Apr 19, 2025
7350bbb
Update client samples to allow normal processing in loop whilst waiti…
k3ldar Apr 19, 2025
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99 changes: 66 additions & 33 deletions libraries/WiFiS3/examples/WiFiWebClient/WiFiWebClient.ino
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -26,12 +26,17 @@

#include "arduino_secrets.h"

#define MaximumConnections 1

///////please enter your sensitive data in the Secret tab/arduino_secrets.h
char ssid[] = SECRET_SSID; // your network SSID (name)
char pass[] = SECRET_PASS; // your network password (use for WPA, or use as key for WEP)
int keyIndex = 0; // your network key index number (needed only for WEP)

int connectionCount = 0;
bool clientConnected = false;
int status = WL_IDLE_STATUS;

// if you don't want to use DNS (and reduce your sketch size)
// use the numeric IP instead of the name for the server:
//IPAddress server(74,125,232,128); // numeric IP for Google (no DNS)
Expand All @@ -46,7 +51,7 @@ WiFiClient client;
void setup() {
/* -------------------------------------------------------------------------- */
//Initialize serial and wait for port to open:
Serial.begin(9600);
Serial.begin(115200);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
Expand All @@ -62,30 +67,19 @@ void setup() {
if (fv < WIFI_FIRMWARE_LATEST_VERSION) {
Serial.println("Please upgrade the firmware");
}

// attempt to connect to WiFi network:
while (status != WL_CONNECTED) {
Serial.print("Attempting to connect to SSID: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network. Change this line if using open or WEP network:
status = WiFi.begin(ssid, pass);

// wait 10 seconds for connection:
delay(10000);
}

printWifiStatus();

Serial.println("\nStarting connection to server...");
// if you get a connection, report back via serial:
if (client.connect(server, 80)) {
Serial.println("connected to server");
// Make a HTTP request:
client.println("GET /search?q=arduino HTTP/1.1");
client.println("Host: www.google.com");
client.println("Connection: close");
client.println();
}

// 3 second wait for connection
client.setConnectionTimeout(3000);
}

void connectToWifi() {
if (status != WL_IDLE_STATUS)
return;

Serial.print("Attempting to connect to SSID: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network. Change this line if using open or WEP network:
status = WiFi.begin(ssid, pass);
}

/* just wrap the received data up to 80 columns in the serial print*/
Expand All @@ -109,16 +103,55 @@ void read_response() {
/* -------------------------------------------------------------------------- */
void loop() {
/* -------------------------------------------------------------------------- */
read_response();
// do some processing
Serial.println("loop processing");

// only allowed to connect n times
if (connectionCount >= MaximumConnections) {
delay(300);
return;
}

// if the server's disconnected, stop the client:
if (!client.connected()) {
Serial.println();
Serial.println("disconnecting from server.");
client.stop();
//connect and wait for connection to be made
connectToWifi();
status = WiFi.isConnected();

// do nothing forevermore:
while (true);
if (status == WL_CONNECTING) {
Serial.println("Connecting to wifi");
delay(200);
}

// If connected to Wifi then send a request to a server
if (status == WL_CONNECTED) {
Serial.println("Connected to WiFi");
printWifiStatus();

Serial.println("\nStarting connection to server...");
clientConnected = client.connect(server, 80);

if (clientConnected) {
connectionCount++;

// if you get a connection, report back via serial:
Serial.println("connected to server");
// Make a HTTP request:
client.println("GET /search?q=arduino HTTP/1.1");
client.println("Host: www.google.com");
client.println("Connection: close");
client.println();

Serial.println("Reading response");
read_response();

if (clientConnected) {
// if the server's disconnected, stop the client:
if (!client.connected()) {
Serial.println();
Serial.println("disconnecting from server.");
client.stop();
}
}
}
}
}

Expand Down
93 changes: 63 additions & 30 deletions libraries/WiFiS3/examples/WiFiWebClientSSL/WiFiWebClientSSL.ino
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -14,11 +14,17 @@

#include "arduino_secrets.h"

#define MaximumConnections 1

///////please enter your sensitive data in the Secret tab/arduino_secrets.h
char ssid[] = SECRET_SSID; // your network SSID (name)
char pass[] = SECRET_PASS; // your network password (use for WPA, or use as key for WEP)


int connectionCount = 0;
bool clientConnected = false;
int status = WL_IDLE_STATUS;

// if you don't want to use DNS (and reduce your sketch size)
// use the numeric IP instead of the name for the server:
//IPAddress server(74,125,232,128); // numeric IP for Google (no DNS)
Expand Down Expand Up @@ -50,30 +56,18 @@ void setup() {
Serial.println("Please upgrade the firmware");
}

// attempt to connect to WiFi network:
while (status != WL_CONNECTED) {
Serial.print("Attempting to connect to SSID: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network.
status = WiFi.begin(ssid, pass);

// wait 10 seconds for connection:
delay(10000);
}

printWifiStatus();
// 3 second wait for connection
modem.readTimeout(3000);
}

Serial.println("\nStarting connection to server...");
// if you get a connection, report back via serial:
void connectToWifi() {
if (status != WL_IDLE_STATUS)
return;

if (client.connect(server, 443)) {
Serial.println("connected to server");
// Make a HTTP request:
client.println("GET / HTTP/1.1");
client.println("Host: www.google.com");
client.println("Connection: close");
client.println();
}
Serial.print("Attempting to connect to SSID: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network. Change this line if using open or WEP network:
status = WiFi.begin(ssid, pass);
}

/* just wrap the received data up to 80 columns in the serial print*/
Expand All @@ -97,16 +91,55 @@ void read_response() {
/* -------------------------------------------------------------------------- */
void loop() {
/* -------------------------------------------------------------------------- */
read_response();
// do some processing
Serial.println("loop processing");

// only allowed to connect n times
if (connectionCount >= MaximumConnections) {
delay(300);
return;
}

// if the server's disconnected, stop the client:
if (!client.connected()) {
Serial.println();
Serial.println("disconnecting from server.");
client.stop();
//connect and wait for connection to be made
connectToWifi();
status = WiFi.isConnected();

// do nothing forevermore:
while (true);
if (status == WL_CONNECTING) {
Serial.println("Connecting to wifi");
delay(200);
}

// If connected to Wifi then send a request to a server
if (status == WL_CONNECTED) {
Serial.println("Connected to WiFi");
printWifiStatus();

Serial.println("\nStarting connection to server...");
clientConnected = client.connect(server, 80);

if (clientConnected) {
connectionCount++;

// if you get a connection, report back via serial:
Serial.println("connected to server");
// Make a HTTP request:
client.println("GET /search?q=arduino HTTP/1.1");
client.println("Host: www.google.com");
client.println("Connection: close");
client.println();

Serial.println("Reading response");
read_response();

if (clientConnected) {
// if the server's disconnected, stop the client:
if (!client.connected()) {
Serial.println();
Serial.println("disconnecting from server.");
client.stop();
}
}
}
}
}

Expand Down
24 changes: 13 additions & 11 deletions libraries/WiFiS3/src/Modem.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -36,12 +36,14 @@ void ModemClass::begin(int badurate, int retry){
_serial->begin(badurate);
string res = "";
_serial->flush();

unsigned long modemTimeout = _timeout;
modem.timeout(500);
while(!beginned && retry > 0) {
beginned = modem.write(string(PROMPT(_SOFTRESETWIFI)),res, "%s" , CMD(_SOFTRESETWIFI));
retry -= 1;
}
modem.timeout(MODEM_TIMEOUT);
modem.timeout(modemTimeout);
}
}

Expand Down Expand Up @@ -186,7 +188,7 @@ ModemClass::ParseResult ModemClass::buf_read(const string &prompt, string &data_
unsigned long start_time = millis();
while(state != at_parse_state_t::Completed) {

if(millis() - start_time > _timeout) {
if(millis() - start_time > _readTimeout) {
res = Timeout;
break;
}
Expand Down Expand Up @@ -293,15 +295,15 @@ ModemClass::ParseResult ModemClass::buf_read(const string &prompt, string &data_
* in data_res contains the length of the next token
*/

if(c == '|') { // sized read, the previous parameter is the length
sized_read_size = atoi(data_res.c_str());
data_res.clear();
if (sized_read_size != 0) {
state = at_parse_state_t::Sized;
} else {
state = at_parse_state_t::Res;
}
} else if(c == '\r') {
if(c == '|') { // sized read, the previous parameter is the length
sized_read_size = atoi(data_res.c_str());
data_res.clear();
if (sized_read_size != 0) {
state = at_parse_state_t::Sized;
} else {
state = at_parse_state_t::Res;
}
} else if(c == '\r') {
state = at_parse_state_t::ResWaitLF;
} else if(c == '\n') {
state = at_parse_state_t::Res;
Expand Down
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