Communications system recovery system
A communications system for a network of stations, is provided where stations identify themselves upon being informed of the desires of an inquisitor station. Additionally, techniques for “plug and play”, self-healing and homogenizing the heterogeneous parts of a network, are provided.
1. For a network of stations having a Base Station, wherein each station sends messages to the Base Station and the sending of a message requires power, and each station is provided with power and each station has a clock and persistent memory and wherein the Base Station maintains a network time for the network stations to coordinate with, a method of recovering the state of the network stations upon the occurrence of a disturbance of that power and a resumption after the power disturbance, comprising the steps of:
each station, while powered,
(a) keeps in said memory, a copy of each message after said message is sent;
(b) indicates on said message copy the status as said message is being sent;
(c) stores time-stamps, based on each station's clock, with each said message copy indicating a time of sending;
(d) upon the occurrence of the power disturbance and then the power resumption, sending to the Base Station, each said time-stamped message copies; and the Base Station re-assembling the messages in chronological order based on said message copies; and wherein said clock re-starts at the time said clock had upon the power disturbance and continues until said clock is able to be coordinated with the network time.
2. The method of claim 1 , wherein said clock is coordinated with network time.
3. The method of claim 2 , wherein, during the process of re-assembling, if the Base Station deduces that a message is missing, querying the relevant station to resend the missing sent message.
4. The method of claim 3 , wherein said step of keeping in said memory is organized in the form of a circular buffer wherein the oldest message is overwritten by the most recent message sent.