Resolve HTTPS Endpoint Issue for AVR-IoT Project

@elect2eng

what AT command have your tried to load the CA certificate? CAn you please send me the full sequence?

@arbu1499

Hi! I can help get your AVR-IoT Cellular Mini (Sequans Monarch 2) transmitting GPS data over HTTPS reliably. The error “CA certificate input too long” usually happens because the device has a size limitation for certificates, and the root CA PEM (ISRG Root X1) is too large. The solution typically involves: Converting the PEM to DER format (binary) to reduce size. Possibly using only the intermediate CA certificate instead of the full root chain if the device supports it. Ensuring the TLS configuration on the device references the correct certificate and uses compatible TLS versions (usually TLS 1.2). Verifying the HTTPS POST logic in Arduino once the certificate is loaded correctly. Once these steps are applied, the TLS handshake should succeed, and your GPS payload will reach the backend reliably. I can guide you through certificate conversion, loading into the modem, and firmware configuration, so your HTTPS requests work without errors. Looking forward for your positive response in the chatbox. Best Regards, Arbaz T

@hannas62

Hello, As an engineer and tutor, I have gained extensive experience in backend development and electronics, skills that would prove invaluable in resolving the TLS issue plaguing your AVR-IoT Cellular Mini project. Throughout my career, I have developed a strong knack for identifying and fixing complex problems, which fall perfectly in line with the roadblock you currently face. Furthermore, my proficiency in tackling intricate scientific principles underscores my ability to understand and troubleshoot your project-specific concerns. I understand that transmitting GPS data via HTTPS is not solely about generating and including the right certificate; it involves configuring the connection properly for successful data transfer. My knowledge spans far and wide, including TLS configuration and certificate management, which makes me well-suited to tackle this task efficiently. In addition to my technical prowess, I bring a passion for ensuring clients' project goals are achieved. I’m not just interested in a quick fix but ensuring your Arduino-based firmware reliably transmits the GPS data needed to the backend regularly. Choose me for tailored problem-solving on this project at the nexus of academic brilliance and project success. Thanks!

@ogfikshun

Hello, I've thoroughly reviewed your AVR-IoT project and understand the critical need to resolve the TLS issue for reliable GPS data transmission. With over 7 years of experience in backend systems and API development, I've encountered and successfully tackled similar challenges. For instance, I recently worked on an IoT project integrating GPS data with a secure backend, ensuring seamless data flow over HTTPS. Leveraging my extensive skills in Linux, microcontrollers, and backend development, I am confident in resolving your current TLS configuration hurdle. My approach will include analyzing the CA certificate handling and converting formats, while ensuring efficient TLS handshake execution. My background in REST API and JSON will facilitate the seamless transmission of your GPS payloads. I invite you to message me with more details. Within 24 hours, I will provide a tailored proposal addressing your project's needs. Best regards,

@apkblack17

Drawing from my extensive experience in web and mobile application development, my proficiency with backend systems and your custom Arduino firmware, I'm confident that I can successfully resolve the HTTPS Endpoint issue for your AVR-IoT project. My knowledge of Linux will be an asset here as it enables a more hands-on approach and emphasizes on problem-solving tendencies, something key when debugging such SSL certificate challenges. In my past projects, I created ERP web applications integrated with many essential servers like Radius servers, payment gateways, AI, e-commerce platforms, accounting systems, chat apps with AI integration, gym booking management systems with IoT integration for turnstile gates, and PoS applications. This vast experience makes me well-versed in handling complex integrations and troubleshooting intricate issues within them. Not only am I confident about resolving the specific issues you mentioned but I'm also eager to empower you with enough knowledge to potentially deal with future TLS hurdles. The result would be reliable GPS data transmission that will not only meet the required time intervals but also grant you peace of mind when it comes to securing your data over HTTPS. So let's collaborate; troubleshoot this TLS issue together while going above and beyond what is expected of me.

@AmanSevak

I can help resolve the HTTPS endpoint issue in your REST API and ensure the endpoint works correctly over secure connections. I will debug the configuration, identify the root cause, and fix the issue so the API responds properly via HTTPS. I have experience working with REST APIs, server configurations, and debugging network/API issues. I can start immediately and deliver the fix quickly. Quick question: Are you running the API on Node.js or another backend framework?

@ositot

Hi! I see you are hitting the memory buffer limit of the Sequans Monarch 2 while trying to load the ISRG Root X1 PEM file. This 'too long' error is a classic constraint in embedded cellular modules when handling verbose X.509 certificates. I can help you resolve this immediately by implementing these 3 steps: DER Binary Conversion: We will convert your PEM (Base64) certificate into a DER (Distinguished Encoding Rules) binary format. This reduces the file size by approximately 33%, which usually fits perfectly in the modem’s secure storage. Flash Management: I will guide you through the specific AT commands (likely AT+SQNCERTW) to write the certificate into the correct NVRAM index, ensuring the modem recognizes the CA for the TLS handshake. Handshake Debugging: We will verify the Cipher Suites and ensure your Arduino firmware is correctly pointing to the stored Certificate ID during the HTTPS POST initialization. I have extensive experience with TLS/SSL handshakes in resource-constrained IoT devices. Let’s get that GPS payload into your backend today.

@abdelrahmanm957

Hi, I can help you resolve this TLS certificate issue on the Sequans Monarch 2 modem. This is a well-known limitation with cellular modems — they often have strict size constraints on certificate buffers, and the ISRG Root X1 PEM certificate (~1.9KB) commonly triggers the "CA certificate input too long" error. Here is exactly what I will do: ✅ Convert the ISRG Root X1 certificate from PEM to DER format — DER is binary and significantly smaller, which is what most modem AT command interfaces expect ✅ Identify the correct AT command sequence for loading certificates into the Sequans Monarch 2 modem properly ✅ Configure TLS parameters correctly for HTTPS operation ✅ Verify the HTTPS POST request reaches your REST API endpoint with the GPS JSON payload ✅ Test and confirm latitude, longitude, and timestamp data appears successfully on your backend I have hands-on experience with cellular modem firmware integration including SIM800C GSM modules, AT command debugging, HTTP/HTTPS communication, and Firebase cloud connectivity in production IoT products. I can start immediately. Delivery: 1-2 days Feel free to message me before awarding. Best regards, Abdelrahman