What does this implement/fix?

Fix getpeername() in LWIP raw TCP socket implementation to return the remote peer's address instead of the local address.

The sockaddr overload of getpeername() was incorrectly using pcb_->local_ip and pcb_->local_port instead of pcb_->remote_ip and pcb_->remote_port. This made it return the same result as getsockname(), which is incorrect:

• getsockname() should return the local address (our side)
• getpeername() should return the remote address (peer's side)

This was a copy-paste bug - the string overloads were already correct:

std::string getpeername() { return this->format_ip_address_(pcb_->remote_ip); }  // Correct
std::string getsockname() { return this->format_ip_address_(pcb_->local_ip); }   // Correct

But the sockaddr overloads were identical:

// Before (wrong):
int getpeername(...) { return this->ip2sockaddr_(&pcb_->local_ip, pcb_->local_port, ...); }
int getsockname(...) { return this->ip2sockaddr_(&pcb_->local_ip, pcb_->local_port, ...); }

// After (fixed):
int getpeername(...) { return this->ip2sockaddr_(&pcb_->remote_ip, pcb_->remote_port, ...); }
int getsockname(...) { return this->ip2sockaddr_(&pcb_->local_ip, pcb_->local_port, ...); }

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Developer breaking change (an API change that could break external components)
• Code quality improvements to existing code or addition of tests
• Other

Related issue or feature (if applicable):

• None

Pull request in esphome-docs with documentation (if applicable):

• N/A

Test Environment

• ESP32
• ESP32 IDF
• ESP8266
• RP2040
• BK72xx
• RTL87xx
• nRF52840

Example entry for config.yaml:

# No configuration changes - this is an internal socket API fix

Checklist:

• The code change is tested and works locally.
• Tests have been added to verify that the new code works (under tests/ folder).

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in esphome-docs.