//return:0 on error, 1 if request is sent and response is received
int DhcpClass::request_DHCP_lease()
{
uint8_t messageType = 0;
// Pick an initial transaction ID
_dhcpTransactionId = random(1UL, 2000UL);
_dhcpInitialTransactionId = _dhcpTransactionId;
_dhcpUdpSocket.stop();
if (_dhcpUdpSocket.begin(DHCP_CLIENT_PORT) == 0) {
// Couldn't get a socket
return 0;
}
presend_DHCP();
int result = 0;
unsigned long startTime = millis();
while (_dhcp_state != STATE_DHCP_LEASED) {
if (_dhcp_state == STATE_DHCP_START) {
_dhcpTransactionId++;
send_DHCP_MESSAGE(DHCP_DISCOVER, ((millis() - startTime) / 1000));
_dhcp_state = STATE_DHCP_DISCOVER;
} else if (_dhcp_state == STATE_DHCP_REREQUEST) {
_dhcpTransactionId++;
send_DHCP_MESSAGE(DHCP_REQUEST, ((millis() - startTime)/1000));
_dhcp_state = STATE_DHCP_REQUEST;
} else if (_dhcp_state == STATE_DHCP_DISCOVER) {
uint32_t respId;
messageType = parseDHCPResponse(_responseTimeout, respId);
if (messageType == DHCP_OFFER) {
// We'll use the transaction ID that the offer came with,
// rather than the one we were up to
_dhcpTransactionId = respId;
send_DHCP_MESSAGE(DHCP_REQUEST, ((millis() - startTime) / 1000));
_dhcp_state = STATE_DHCP_REQUEST;
}
} else if (_dhcp_state == STATE_DHCP_REQUEST) {
uint32_t respId;
messageType = parseDHCPResponse(_responseTimeout, respId);
if (messageType == DHCP_ACK) {
_dhcp_state = STATE_DHCP_LEASED;
result = 1;
//use default lease time if we didn't get it
if (_dhcpLeaseTime == 0) {
_dhcpLeaseTime = DEFAULT_LEASE;
}
// Calculate T1 & T2 if we didn't get it
if (_dhcpT1 == 0) {
// T1 should be 50% of _dhcpLeaseTime
_dhcpT1 = _dhcpLeaseTime >> 1;
}
if (_dhcpT2 == 0) {
// T2 should be 87.5% (7/8ths) of _dhcpLeaseTime
_dhcpT2 = _dhcpLeaseTime - (_dhcpLeaseTime >> 3);
}
//return:0 on error, 1 if request is sent and response is received, 2 if acquiring address
int DhcpClass::request_DHCP_lease_loop(){ //mg
uint8_t messageType = 0;
int result = 2;
if(_dhcp_state != STATE_DHCP_LEASED)
{
if(_dhcp_state == STATE_DHCP_START)
{
_dhcpTransactionId++;
send_DHCP_MESSAGE(DHCP_DISCOVER, ((millis() - _startTimeRequest) / 1000));
_dhcp_state = STATE_DHCP_DISCOVER;
}
else if(_dhcp_state == STATE_DHCP_REREQUEST){
_dhcpTransactionId++;
send_DHCP_MESSAGE(DHCP_REQUEST, ((millis() - _startTimeRequest)/1000));
_dhcp_state = STATE_DHCP_REQUEST;
}
else if(_dhcp_state == STATE_DHCP_DISCOVER)
{
uint32_t respId;
// messageType = parseDHCPResponse(_responseTimeout, respId);
messageType = parseDHCPResponse(1, respId); //disable timeout, wait max 50ms
if(messageType == DHCP_OFFER)
{
// We'll use the transaction ID that the offer came with,
// rather than the one we were up to
_dhcpTransactionId = respId;
send_DHCP_MESSAGE(DHCP_REQUEST, ((millis() - _startTimeRequest) / 1000));
_dhcp_state = STATE_DHCP_REQUEST;
}
}
else if(_dhcp_state == STATE_DHCP_REQUEST)
{
uint32_t respId;
// messageType = parseDHCPResponse(_responseTimeout, respId);
messageType = parseDHCPResponse(1, respId); //disable timeout, wait max 50ms
if(messageType == DHCP_ACK)
{
_dhcp_state = STATE_DHCP_LEASED;
result = 1;
//use default lease time if we didn't get it
if(_dhcpLeaseTime == 0){
_dhcpLeaseTime = DEFAULT_LEASE;
}
// Calculate T1 & T2 if we didn't get it
if(_dhcpT1 == 0){
// T1 should be 50% of _dhcpLeaseTime
_dhcpT1 = _dhcpLeaseTime >> 1;
}
if(_dhcpT2 == 0){
// T2 should be 87.5% (7/8ths) of _dhcpLeaseTime
_dhcpT2 = _dhcpLeaseTime - (_dhcpLeaseTime >> 3);
}
