Sub SendPostRequest() Dim http As Object Dim binaryData As String ' Create a WinHttpRequest object Set http = CreateObject("WinHttp.WinHttpRequest.5.1") ' Define the binary data (00 00 00 00 04 82 F7 02 00) binaryData = ChrW(&H0) & ChrW(&H0) & ChrW(&H0) & ChrW(&H0) & _ ChrW(&H4) & ChrW(&H82) & ChrW(&HF7) & ChrW(&H2) & ChrW(&H0) ' Open the connection http.Open "POST", "http://192.168.100.1:9201/SpaceX.API.Device.Device/Handle", False ' Set the headers http.SetRequestHeader "Content-Length", Len(binaryData) http.SetRequestHeader "X-User-Agent", "grpc-web-javascript/0.1" http.SetRequestHeader "X-Grpc-Web", "1" http.SetRequestHeader "User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.6099.199 Safari/537.36" http.SetRequestHeader "Content-Type", "application/grpc-web-proto" http.SetRequestHeader "Accept", "*/*" http.SetRequestHeader "Origin", "http://localhost" http.SetRequestHeader "Accept-Encoding", "gzip, deflate, br" http.SetRequestHeader "Accept-Language", "en-US,en;q=0.9" http.SetRequestHeader "Connection", "close" ' Send the binary data http.Send binaryData ' Check the response (for debugging purposes) Debug.Print "Status: " & http.Status Debug.Print "Response: " & http.ResponseText ' Clean up Set http = Nothing End Sub