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  1. I've been tinkering with AWS IoT in conjunction with CC3200 + Energia for a while now with varying degrees of success. The purpose of this post is using the RESTful API to update a "thing" status in the cloud. The code is listed below and I'm seeing some authentication errors. I was hoping someone can correct me if there are any errors in the way I'm using "client.ssConnect". I used a slightly modified WiFiClient.cpp and WiFiClient.h from here. I know its not a library issue since I'm able to connect using MQTT. char aws_endpoint[] = "xxxxxxxxxxxxxx.iot.us-east-1.amazonaws.com"; if (client.sslConnect(aws_endpoint, 443)) { Serial.println("Connected to server"); String PostData = "{\"value1\" : \"testValue\", \"value2\" : \"Hello\", \"value3\" : \"World!\" }"; request = "POST /things/"; request += thingname; request += "/shadow"; request += " HTTP/1.1"; Serial.print("Request:\t"); Serial.println(request); Serial.print("Post data:\t"); Serial.println(PostData); client.println(request); client.println("Host: "); client.println(aws_endpoint); //client.println(":443"); client.println("User-Agent: Energia/1.1"); client.println("Connection: close"); client.println("Content-Type: application/json"); client.print("Content-Length: "); client.println(PostData.length()); client.println(); client.println(PostData); client.println(); } else { Serial.println("Connection failed"); } Serial.println(); // Capture response from the server. (10 second timeout) long timeOut = 5000; long lastTime = millis(); while((millis()-lastTime) < timeOut) { // Wait for incoming response from server while (client.available()) { // Characters incoming from the server char c = client.read(); // Read characters Serial.write(c); } } Here is the output that I see: RootCA found! Client certificates found! Device ID is: 3250763216 Attempting to connect to WiFi network . Connected to WiFi network: ABCDEFGH Waiting for IP IP is: 192.168.1.107 Connected to server Request: POST /things/MyCC3200/shadow HTTP/1.1 Post data: {\"value1\" : \"testValue\", \"value2\" : \"Hello\", \"value3\" : \"World!\" } HTTP/1.1 403 Forbidden content-type: application/json content-length: 91 date: Tue, 26 Jul 2016 11:46:59 GMT x-amzn-RequestId: 4d5388a9-e3c4-460a-b674-c3f971f3330d connection: Keep-Alive x-amzn-ErrorType: ForbiddenException: {"message":"Missing Authentication Token","traceId":"4d5388a9-e3c4-460a-b674-c3f971f3330d"}