gsm_read_ea_val
len = gsm_read_ea_val(&addr, data, cl);
len = gsm_read_ea_val(&modem, dp, cl);
len = gsm_read_ea_val(&modem, data, clen);
dlen = gsm_read_ea_val(&command, data, len);
dlen = gsm_read_ea_val(&clen, data, len);
if (gsm_read_ea_val(&cmd, msg->data + 2, msg->len - 2) < 1)