added nfc programs

prog2/sendkromer.lua

@@ -0,0 +1,66 @@
+-- Load private key
+local keyFile = fs.open("private.key", "r")
+if not keyFile then
+    print("Private key file not found.")
+    return
+end
+
+local privateKey = keyFile.readAll()
+keyFile.close()
+
+write("Recipient Kromer address: ")
+local to = read()
+
+write("Amount to send (in KST): ")
+local amountInput = read()
+local amount = tonumber(amountInput)
+if not amount or amount <= 0 then
+    print("Invalid amount.")
+    return
+end
+
+write("Metadata (optional): ")
+local metadata = read()
+
+local payload = {
+    amount = amount,
+    to = to,
+    metadata = metadata ~= "" and metadata or nil,
+    privatekey = privateKey
+}
+
+local url = "https://kromer.reconnected.cc/api/krist/transactions"
+
+local headers = {
+    ["Content-Type"] = "application/json"
+}
+
+local json = textutils.serializeJSON(payload)
+print("Sending transaction to Kromer API...")
+local response = http.post(url, json, headers)
+
+if not response then
+    print("Failed to contact Kromer API.")
+    return
+end
+
+local result = response.readAll()
+response.close()
+
+local success, data = pcall(textutils.unserializeJSON, result)
+if not success then
+    print("Error parsing response: " .. result)
+    return
+end
+
+if data.error then
+    print("Transaction failed: " .. data.error)
+else
+    print("Transaction successful!")
+    if data.transaction and data.transaction.txid then
+        print("TX ID: " .. data.transaction.txid)
+    else
+        print("No TX ID returned. Raw transaction data:")
+        print(textutils.serialize(data.transaction))
+    end
+end