From f3cb263aaac48fee2052af9b3fa0c47f2d594187 Mon Sep 17 00:00:00 2001
From: Harald Barth <haba@kth.se>
Date: Fri, 23 Jun 2023 13:54:25 +0200
Subject: [PATCH] convert mac addr hex chars to lower case to be compatible
 with AT software

---
 WifiESP32.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/WifiESP32.cpp b/WifiESP32.cpp
index 9a74138..bc22d16 100644
--- a/WifiESP32.cpp
+++ b/WifiESP32.cpp
@@ -106,6 +106,12 @@ void wifiLoop(void *){
 }
 #endif
 
+char asciitolower(char in) {
+  if (in <= 'Z' && in >= 'A')
+    return in - ('Z' - 'z');
+  return in;
+}
+
 bool WifiESP::setup(const char *SSid,
                     const char *password,
                     const char *hostname,
@@ -183,6 +189,8 @@ bool WifiESP::setup(const char *SSid,
     strMac.remove(0,9);
     strMac.replace(":","");
     strMac.replace(":","");
+    // convert mac addr hex chars to lower case to be compatible with AT software
+    std::transform(strMac.begin(), strMac.end(), strMac.begin(), asciitolower);
     strSSID.concat(strMac);
     strPass.concat(strMac);