nuttxs opened a new pull request, #3152:
URL: https://github.com/apache/nuttx-apps/pull/3152
## Summary
- netutils/dhcpc/dhcpc: add implementation to get renewal (T1) time and
rebinding (T2) time from DHCP packet
- According to RFC 2131, T1 and T2 times play a critical role in lease
management in DHCP clients.
### T1 Time (Renewal Time)
- **Definition**: The time at which the client enters the RENEWING state.
- **Default Value**: 50% of the lease time (0.5 × lease_time).
- **Actions**: When the T1 time is reached, the client will:
- Enter the RENEWING state.
- Send a unicast DHCPREQUEST message to the original DHCP server to renew
the lease.
- Attempt to extend the current IP address lease.
### T2 Time (Rebinding Time)
- **Definition**: The time at which the client enters the REBINDING state.
- **Default Value**: 87.5% of the lease time (0.875 × lease_time).
- **Actions**: When the T2 time is reached (and T1 renewal has failed), the
client will:
- Enter the REBINDING state.
- Send a broadcast DHCPREQUEST message to all DHCP servers.
- Attempt to obtain a lease extension from any available DHCP server.
## Impact
New Feature/Change: Correctly receive and store T1 and T2 time provided by
the server
User Impact: Provide a foundation for the implementation of intelligent
renewal mechanism in the future
Build Impact:No new Kconfig options or build system changes.
Hardware Impact: No
Security: No
Compatibility: Backward-compatible; no breaking changes.
## Testing
#Use tcpdump to capture DHCP traffic
#View options 58 and 59 in DHCP ACK packets
#Option 58: T1 Time
#Option 59: T2 Time
#Compare the time(t1/t2) with the interface dhcp_denew()
<img width="1381" height="349" alt="图片"
src="https://github.com/user-attachments/assets/4bf39495-f7b2-41dd-9ed9-77da2c8260a6";
/>
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