I’m testing two XBee Pro S3B 900HP, configured one of them as Coordinator and another one as End device. The end device is driven by a microcontroller; the Coordinator is connected to a PC by XCTU soft. The both modules are configured API=1. All is OK, except I need to send the API frame from the End device a lot of times (I did a loop in the microcontroller program) before the Coordinator could receive the packet. The delay is around 10 or more seconds. After the first transmission is received, there isn’t a delay for the next. Can you tell me what parameter, etc. I forgot in the configuration.? Thanks in advance.
Are you using CTS flow control? Have you verified the path using a Node Discover? Is the end device sleeping? If so, what sleep settings are you using?