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Arduino library that loads multiple SSIDs and passwords from a MicroSD card.

Create a CSV file named aps.csv. Write SSIDs and passwords into it.

SSID1,password_of_ssid1
SSID2,password_of_ssid2
SSID3,password_of_ssid3

Put aps.csv at the root directory of a MicroSD card.
To register SSID, call addAPfromSD() from your program.
Next, call connectToAP() in order to connect to the access point.

It loads a CSV file specified by the fileName argument and registers SSIDs and passwords of the CSV file.
You can omit fileName, then the file aps.csv will be loaded, which is located in the root directory of the MicroSD card.

void addAPfromSD()
void addAPfromSD(const char* fileName="/aps.csv")

It connects to the access point registered with addAPfromSD.
If numberOfTrials is specified, the connection is abandoned if no connection to the access point can be established after the specified number of attempts.

bool connectToAP()
bool connectToAP(const uint8_t numberOfTrials)