Add invalid session error definition and increase max payload from 513 to 4096

Author: MikaKaunisto

src/uds/uds.c

@@ -72,7 +72,7 @@ static uint16_t autoset_pid_length(uint8_t mode, uint16_t pid,
 
 static void send_diagnostic_request(DiagnosticShims* shims,
         DiagnosticRequestHandle* handle) {
-    uint8_t payload[512] = {0};
+    uint8_t payload[4096] = {0};
     payload[MODE_BYTE_INDEX] = handle->request.mode;
     if(handle->request.has_pid) {
         handle->request.pid_length = autoset_pid_length(handle->request.mode,

src/uds/uds_types.h

@@ -24,7 +24,7 @@ extern "C" {
 // multiframe response. May need to dynamically allocate in the future.
 #define MAX_UDS_RESPONSE_PAYLOAD_LENGTH 127
 #endif
-#define MAX_UDS_REQUEST_PAYLOAD_LENGTH 513
+#define MAX_UDS_REQUEST_PAYLOAD_LENGTH 4096
 #define MAX_RESPONDING_ECU_COUNT 8
 #define VIN_LENGTH 17
 
@@ -96,7 +96,8 @@ typedef enum {
     NRC_TIME_DELAY_NOT_EXPIRED = 0x37,
     NRC_GENERIC_PROGRAMMING_FAILURE = 0x48,
     NRC_TRANSFER_SUSPENDED = 0x71,
-    NRC_RESPONSE_PENDING = 0x78
+    NRC_RESPONSE_PENDING = 0x78,
+    NRC_INVALID_SESSION = 0x7F,
 } DiagnosticNegativeResponseCode;
 
 /* Public: A partially or fully completed response to a diagnostic request.