TWENET initialization is also executed after the setup() function exits. Do not do anything other than initialization here, since most of the processing is done after TWENET exits.

Items to be noted are listed below.

• Sleep the_twenet.sleep() cannot be executed. If you want to sleep immediately after initialization, write the first sleep process in the begin() function.
• The delay() function is replaced by the processing described below. In this case, the parameter ms does not specify milliseconds.

* Alternative processing for delay().

static inline void delay(uint32_t ms) {
        volatile uint32_t ct = ms * 4096;
        while (ct > 0) {
            --ct;
        }
}