SMTP client

Collaboration diagram for SMTP client:

Modules
	Options

Detailed Description

This is simple SMTP client for raw API. It is a minimal implementation of SMTP as specified in RFC 5321.

Example usage:

void my_smtp_result_fn(void *arg, u8_t smtp_result, u16_t srv_err, err_t err)
{
  printf("mail (%p) sent with results: 0x%02x, 0x%04x, 0x%08x\n", arg,
         smtp_result, srv_err, err);
}
static void my_smtp_test(void)
{
  smtp_set_server_addr("mymailserver.org");
  -> set both username and password as NULL if no auth needed
  smtp_set_auth("username", "password");
  smtp_send_mail("sender", "recipient", "subject", "body", my_smtp_result_fn,
                 some_argument);
}

When using from any other thread than the tcpip_thread (for NO_SYS==0), use smtp_send_mail_int()!

SMTP_BODYDH usage:

int my_smtp_bodydh_fn(void *arg, struct smtp_bodydh *bdh)
{
   if(bdh->state >= 10) {
      return BDH_DONE;
   }
   sprintf(bdh->buffer,"Line #%2d\r\n",bdh->state);
   bdh->length = strlen(bdh->buffer);
   ++bdh->state;
   return BDH_WORKING;
}
 
smtp_send_mail_bodycback("sender", "recipient", "subject",
               my_smtp_bodydh_fn, my_smtp_result_fn, some_argument);

Todo:

:

• attachments (the main difficulty here is streaming base64-encoding to prevent having to allocate a buffer for the whole encoded file at once)
• test with more mail servers...