diff --git a/opensprinkler_server.cpp b/opensprinkler_server.cpp
index 02075557..5ee33472 100644
--- a/opensprinkler_server.cpp
+++ b/opensprinkler_server.cpp
@@ -46,7 +46,7 @@
 		#define OTF_PARAMS_DEF const OTF::Request &req,OTF::Response &res
 		#define OTF_PARAMS req,res
 		#define FKV_SOURCE req
-		#define handle_return(x) {if(x==HTML_OK) res.writeBodyChunk((char *)"%s",ether_buffer); else otf_send_result(req,res,x); return;}
+		#define handle_return(x) {if(x==HTML_OK) res.writeBodyData(ether_buffer, strlen(ether_buffer)); else otf_send_result(req,res,x); return;}
 
 	#else
 
@@ -218,7 +218,7 @@ void rewind_ether_buffer() {
 
 void send_packet(OTF_PARAMS_DEF) {
 #if defined(ESP8266)
-	res.writeBodyChunk((char *)"%s",ether_buffer);
+	res.writeBodyData(ether_buffer, strlen(ether_buffer));
 #else
 	m_client->write((const uint8_t *)ether_buffer, strlen(ether_buffer));
 #endif
diff --git a/platformio.ini b/platformio.ini
index 8ca2903f..681d87a4 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -24,8 +24,7 @@ lib_deps =
      sui77/rc-switch @ ^2.6.3
      https://github.com/ThingPulse/esp8266-oled-ssd1306/archive/4.2.0.zip
      knolleary/PubSubClient @ ^2.8
-     https://github.com/OpenThingsIO/OpenThings-Framework-Firmware-Library/archive/refs/heads/master.zip
-     https://github.com/Links2004/arduinoWebSockets/archive/refs/tags/2.3.5.zip
+     https://github.com/OpenThingsIO/OpenThings-Framework-Firmware-Library @ ^0.1.0
 ; ignore html2raw.cpp source file for firmware compilation (external helper program)
 build_src_filter = +<*> -<html/*>
 upload_speed = 460800