Here is a very small example of how poorly AIS NB-IoT performs on the East side of my building (pictured above), from my UDP server logs.
In my sketch, every time a UDP message is sent, the sequence number is incremented by one. On the UDP server side, it logs each time it receives a package, including the RSSI and Sequence #:
Code:
waiting to receive message
1578313941.2: received 42 bytes from ('119.31.119.163', 33333)
1578313941.2: my signal csq: N/A rssi: N/AdBm seq: 677
1578313941.2: sent 24 bytes back to ('119.31.119.163', 33333)
waiting to receive message
1578313941.54: received 41 bytes from ('119.31.119.163', 33333)
1578313941.54: my signal csq: 29 rssi: -55dBm seq: 678
1578313941.54: sent 25 bytes back to ('119.31.119.163', 33333)
waiting to receive message
1578314106.17: received 41 bytes from ('119.31.119.163', 33333)
1578314106.17: my signal csq: 31 rssi: -51dBm seq: 686
1578314106.17: sent 25 bytes back to ('119.31.119.163', 33333)
waiting to receive message
1578316246.96: received 42 bytes from ('119.31.119.254', 33333)
1578316246.96: my signal csq: N/A rssi: N/AdBm seq: 759
1578316246.96: sent 25 bytes back to ('119.31.119.254', 33333)
waiting to receive message
1578316263.66: received 42 bytes from ('119.31.119.254', 33333)
1578316263.66: my signal csq: N/A rssi: N/AdBm seq: 760
1578316263.66: sent 25 bytes back to ('119.31.119.254', 33333)
waiting to receive message
1578317185.86: received 42 bytes from ('119.31.119.254', 33333)
1578317185.86: my signal csq: 30 rssi: -53dBm seq: 1168
1578317185.86: sent 25 bytes back to ('119.31.119.254', 33333)
I find it interesting (but not very interesting) that AIS coverts the BC95 RSSI / CSQ of 99 (undetectable) to "N/A" in the AIS library, but it can still (sometimes) transmit / receive even at 99:
... anyway, I hope AIS network engineers find this helpful in their analysis of this area.
This issue only happens on the East side (city side) of this building, the West side (ocean facing side), does not experience this problem and no UDP messages are lost.
I'll leave this NB-IoT shield on the East side of the building for the next 24 hours, transmitting and receiving on the NB-IoT network, so AIS can troubleshoot their network:
dear experts
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01-06-2020
