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Point to multipoint Gazelle sensor project, help needed.

Hello, I would like to build a sensor array that communicate with one master in a star topology. I have played with the Gazelle protocol example (gzll_ack_payload examples) on the SDK Rev12. I was able to set payload to 3 bytes and use the first byte as the device id and other bytes as useful info about the sensor state. on one sensor and one host I got what I wanted, however, once I programmed 2 sensors with different ID everything stopped working. I am well aware that both sensors cannot operate with only payload variation, and I am stuck here. what is required to do in order to sync both sensors/multi sensors (even on expense of throughput)? Sensors do not need to supply a stream of data, a keep-alive and IO change at 50mS rate would do pretty OK. I do not use a softdevice, I have my own HW version, quite similar to PCA10028. HW is working OK. Any help is much appreciated, thanks.

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